My *real* passion is physics. I wrote or coauthored several (mostly) physics papers (for a bibtex file containing a complete list of my publications, please click here, or here for a PDF):

- Wave-optical treatment of the shadow cast by a large gravitating sphere, Slava G. Turyshev and Viktor T. Toth, arXiv:1805.10581 [gr-qc]
- NGC 1052-DF2 And Modified Gravity (MOG) Without Dark Matter, J. W. Moffat and V. T. Toth, arXiv:1805.01117 [gr-qc]
- Scattering of light by plasma in the solar system, Slava G. Turyshev and Viktor T. Toth, arXiv:1805.00398 [physics.optics]
- Recognizing the Value of the Solar Gravitational Lens for Direct Multipixel Imaging and Spectroscopy of an Exoplanet, Slava G. Turyshev, Michael Shao, Janice Shen, Hanying Zhou, Viktor T. Toth, Louis Friedman, Leon Alkalai, Nitin Arora, Darren D. Garber, Henry Helvajian, Thomas Heinsheimer, Siegfried W. Janson, Les Johnson, Jared R. Males, Roy Nakagawa, Seth Redfield, Nathan Strange, Mark R. Swain, David Van Buren, John L. West, Stacy Weinstein-Weiss, arXiv:1803.04319 [astro-ph.IM]
- Direct Multipixel Imaging and Spectroscopy of an Exoplanet with a Solar Gravity Lens Mission, Slava G. Turyshev, Michael Shao, Leon Alkalai, Nitin Aurora, Darren Garber, Henry Helvajian, Tom Heinsheimer, Siegfried Janson, Jared R. Males, Dmitri Mawet, Roy Nakagawa, Seth Redfield, Janice Shen, Nathan Strange, Mark R. Swain, Viktor T. Toth, Phil A. Willems, John L. West, Stacy Weinstein-Weiss, Hanying Zhou, arXiv:1802.08421 [astro-ph.IM]
- Wave-optical treatment of the shadow cast by a large sphere, Slava G. Turyshev and Viktor T. Toth, arXiv:1801.06253 [physics.optics], Phys. Rev. A 97, 033810 (2018); DOI: 10.1103/PhysRevA.97.033810
- Modified Gravity (MOG), the speed of gravitational radiation and the event GW170817/GRB170817A, M. A. Green, J. W. Moffat and V. T. Toth, arXiv:1710.11177 [gr-qc], Phys. Lett. B 780, 300-302 (2018); DOI: 10.1016/j.physletb.2018.03.015
- Diffraction of electromagnetic waves in the gravitational field of the Sun, Slava G. Turyshev and Viktor T. Toth, arXiv:1704.06824 [gr-qc], Phys. Rev. D 96, 024008 (2017); DOI: 10.1103/PhysRevD.96.024008
- Efficient real-time allocation of patrol cars in traffic management, Hussain Al-Harthei, Viktor T. Toth, Atef Garib and Samy A. Mahmoud, Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering (CSEE'17), ICTE-105, DOI: 10.11159/icte17.105
- Sparse Representations of Clifford and Tensor algebras in Maxima, Dimiter Prodanov and Viktor T. Toth, arXiv:1604.06967 [cs.SC], Adv. Appl. Clifford Algebras (2017) 27:661; DOI: 10.1007/s00006-016-0682-x
- General relativistic observables for the ACES experiment, Slava G. Turyshev, Nan Yu, and Viktor T. Toth, arXiv:1512.09019 [gr-qc], Phys. Rev. D 93, 045027 (2016); DOI: 10.1103/PhysRevD.93.045027
- TianQin: a space-borne gravitational wave detector, Jun Luo, Li-Sheng Chen, Hui-Zong Duan, Yun-Gui Gong, Shoucun Hu, Jianghui Ji, Qi Liu, Jianwei Mei, Vadim Milyukov, Mikhail Sazhin, Cheng-Gang Shao, Viktor T. Toth, Hai-Bo Tu, Yamin Wang, Yan Wang, Hsien-Chi Yeh, Ming-Sheng Zhan, Yonghe Zhang, Vladimir Zharov and Ze-Bing Zhou, arXiv:1512.02076 [astro-ph.IM], Class. Quant. Grav. 33 (2016) 035010, DOI: 10.1088/0264-9381/33/3/035010
- Evolution and dynamical properties of Bose-Einstein condensate dark matter stars, Eniko J. M. Madarassy and Viktor T. Toth, arXiv:1412.7152 [hep-ph], Phys. Rev. D 91, 044041 (2015); DOI: 10.1103/PhysRevD.91.044041.
**Featured in the February 2015 Kaleidoscope**and on the**2016 APS print calendar**. - Rotational Velocity Curves in the Milky Way as a Test of Modified Gravity, J. W. Moffat and V. T. Toth, arXiv:1411.6701 [astro-ph.GA], Phys. Rev. D 91, 043004 (2015); DOI: 10.1103/PhysRevD.91.043004
- Accelerating classical charges and the equivalence principle, Viktor T. Toth, arXiv:1404.2801 [gr-qc]
- Karlhede's invariant and the black hole firewall proposal, J. W. Moffat and V. T. Toth, arXiv:1404.1845 [gr-qc]
- General relativistic laser interferometric observables of the GRACE-Follow-On mission, Slava G. Turyshev, Mikhail V. Sazhin and Viktor T. Toth, arXiv:1402.7111 [gr-qc], Phys. Rev. D 89, 105029 (2014); DOI: 10.1103/PhysRevD.89.105029
- Self-gravitating Bose-Einstein condensates and the Thomas-Fermi approximation, Viktor T. Toth, arXiv:1402.0600 [gr-qc], Galaxies 2016, 4(3), 9, DOI: 10.3390/galaxies4030009
- New perturbative method for solving the gravitational N-body problem in general relativity, Slava G. Turyshev and Viktor T. Toth, arXiv:1304.8122 [gr-qc], Int. J. Mod. Phys. D24 (2015) 6, 1550039, DOI: 10.1142/S021827181550039X
- Humidification requirements in economizer-type HVAC systems, ASHRAE Transactions 119(1) (2013), DA-13-022
- General relativistic observables of the GRAIL mission, Slava G. Turyshev, Viktor T. Toth and Mikhail V. Sazhin, arXiv:1212.0232 [gr-qc], Phys. Rev. D 87, 024020 (2013); DOI: 10.1103/PhysRevD.87.024020
- Numerical simulation code for self-gravitating Bose-Einstein condensates, Eniko J. M. Madarassy and Viktor T. Toth, arXiv:1207.5249 [astro-ph.GA], Computer Physics Communications 184 (2013), pp. 1339-1343; DOI: 10.1016/j.cpc.2012.12.024
- Applying MOG to lensing: Einstein rings, Abell 520 and the Bullet Cluster, J. W. Moffat, S. Rahvar and V. T. Toth, arXiv:1204.2985 [astro-ph.CO], Galaxies 2018 6(2), 43, DOI:10.3390/galaxies6020043
- Support for the thermal origin of the Pioneer anomaly, Slava G. Turyshev, Viktor T. Toth, Gary Kinsella, Siu-Chun Lee, Shing M. Lok and Jordan Ellis, arXiv:1204.2507 [gr-qc], Phys. Rev. Lett. 108, 241101 (2012); DOI: 10.1103/PhysRevLett.108.241101.
**Featured on the cover of Vol. 108, Iss. 24 (June 15, 2012)** - Comment on "The Real Problem with MOND" by Scott Dodelson, J. W. Moffat and V. T. Toth, arXiv:1112.4386 [astro-ph.CO]
- Accelerating relativistic reference frames in Minkowski space-time, Slava G. Turyshev, Olivier L. Minazzoli and Viktor T. Toth, arXiv:1109.1796 [gr-qc], J. Math. Phys. 53, 032501 (2012); DOI: 10.1063/1.3692166
- Support for temporally varying behavior of the Pioneer anomaly from the extended Pioneer 10 and 11 Doppler data sets, Slava G. Turyshev, Viktor T. Toth, Jordan Ellis and Craig B. Markwardt, arXiv:1107.2886 [gr-qc], Phys. Rev. Lett. 107, 081103 (2011); DOI: 10.1103/PhysRevLett.107.081103
- Cosmological observations in a modified theory of gravity (MOG), J. W. Moffat and V. T. Toth, arXiv:1104.2957 [astro-ph.CO], Galaxies 2013, 1(1), 65-82; DOI: 10.3390/galaxies1010065
- Testing Modified Gravity (MOG) with gas-dominated galaxies, J. W. Moffat and V. T. Toth, arXiv:1103.5634 [astro-ph.GA]
- Cosmological consequences of Modified Gravity (MOG), Viktor T. Toth, arXiv:1011.5174 [gr-qc], Expanded version of invited talk given at the International Conference on Two Cosmological Models, Universidad Iberoamericana, Ciudad de Mexico, November 17-19, 2010
- Can Modified Gravity (MOG) explain the speeding Bullet (Cluster)?, J. W. Moffat and V. T. Toth, arXiv:1005.2685 [gr-qc]
- The virial theorem and planetary atmospheres, Viktor T. Toth, arXiv:1002.2980 [physics.gen-ph], Időjárás - Quarterly Journal of the Hungarian Meteorological Service (HMS), Vol. 114, No. 3, pp. 229-234
- The Pioneer Anomaly, Slava G. Turyshev and Viktor T. Toth, arXiv:1001.3686 [gr-qc], Living Revs. Relativity
**13**, (2010), 4; DOI: 10.12942/lrr-2010-4 - Modified Jordan-Brans-Dicke theory with scalar current and the Eddington-Robertson gamma-parameter, John. W. Moffat and Viktor T. Toth, arXiv:1001.1564 [gr-qc], Int. J. Mod. Phys. D21 (2012), 12, 1250084, DOI: 10.1142/S0218271812500848
- Observationally Verifiable Predictions of Modified Gravity, J. W. Moffat and V. T. Toth, arXiv:0908.0781 [astro-ph.CO], Talk given by JWM at the "The Invisible Universe" conference, Paris, France, June 29-July 3, 2009; AIP Conf. Proc. 1241, 1066-1073, DOI: 10.1063/1.3462601
- Redesigning Electroweak Theory: Does the Higgs Particle Exist?, J. W. Moffat and V. T. Toth, arXiv:0908.0780 [hep-th], Talk given by JWM at the Tenth Workshop on Non-Perturbative QCD at l'Institut d'Astrophysique de Paris, France, 8-12 June 2009
- The Puzzle of the Flyby Anomaly, Slava G. Turyshev and Viktor T. Toth, arXiv:0907.4184 [gr-qc] Space Science Reviews 148(1), 169-174 (2010), DOI: 10.1007/s11214-009-9571-0
- The Pioneer Anomaly in the Light of New Data, Slava G. Turyshev and Viktor T. Toth, arXiv:0906.0399 [gr-qc] Space Science Reviews 148(1), 149-167 (2010), DOI: 10.1007/s11214-009-9543-4
- Comment on "Modified scalar-tensor-vector gravity theory and the constraint on its parameters" by Deng, et al., J. W. Moffat and V. T. Toth, arXiv:0903.5291 [gr-qc]
- Thermal recoil force, telemetry, and the Pioneer anomaly, Viktor T. Toth and Slava G. Turyshev, arXiv:0901.4597 [physics.space-ph], Phys. Rev. D. 79, 043011 (2009), DOI: 10.1103/PhysRevD.79.043011
- Independent analysis of the orbits of Pioneer 10 and 11, Viktor T. Toth, arXiv:0901.3466 [gr-qc], Int. J. Mod. Phys. D18 (2009) 5, 717-741, DOI: 10.1142/S0218271809014728
- Satellite galaxy velocity dispersions in the SDSS and modified gravity models, J. W. Moffat and V. T. Toth, 0901.1927 [astro-ph], Galaxies 2014, 2(2), 263-274; DOI: 10.3390/galaxies2020263
- The running of coupling constants and unitarity in a finite electroweak model, J. W. Moffat and V. T. Toth, 0812.1994 [hep-ph]
- A finite electroweak model without a Higgs particle, J. W. Moffat and V. T. Toth, arXiv:0812.1991 [hep-ph]
- The bending of light and lensing in modified gravity, J. W. Moffat and V. T. Toth, arXiv:0805.4774 [astro-ph], MNRAS 397 (2009) 1885-1992, DOI: 10.1111/j.1365-2966.2009.14876.x
- Fundamental parameter-free solutions in Modified Gravity, J. W. Moffat and V. T. Toth, arXiv:0712.1796 [gr-qc], Class. Quant. Grav. 26 (2009) 085002, DOI: 10.1088/0264-9381/26/8/085002
- Modified gravity and the origin of inertia, J. W. Moffat and V. T. Toth, arXiv:0710.3415 [gr-qc], MNRAS Letters 395 (2009) L25-L28, DOI: 10.1111/j.1745-3933.2009.00633.x
- Pioneer Anomaly: Evaluating Newly Recovered Data, Viktor T. Toth and Slava G. Turyshev, arXiv:0710.2656 [gr-qc], AIP Conf. Proc. 977, 264-283 (2008), DOI: 10.1063/1.2902790
- Modified Gravity: Cosmology without dark matter or Einstein's cosmological constant, J. W. Moffat and V. T. Toth, arXiv:0710.0364 [astro-ph]
- Physics Engineering in the Study of the Pioneer Anomaly, Slava G. Turyshev and Viktor T. Toth, arXiv:0710.0191 [physics.space-ph], invited talk at the "IV Physics Engineering International Meeting," Mexico City, Mexico, 15-19 October 2007
- Testing modified gravity with globular cluster velocity dispersions, J. W. Moffat and V. T. Toth, arXiv:0708.1935 [gr-qc] ApJ 680, 1158 (2008), DOI: 10.1086/587926
- Testing modified gravity with motion of satellites around galaxies, J. W. Moffat and V. T. Toth, arXiv:0708.1264 [astro-ph]
- The Pioneer Anomaly: Seeking an explanation in newly recovered data, Viktor T. Toth and Slava G. Turyshev, arXiv:gr-qc/0603016 Can. J. Phys. 84: 1063-1087 (2006), DOI: 10.1139/P07-005
- The Study of the Pioneer Anomaly: New Data and Objectives for New Investigation, Slava G. Turyshev, Viktor T. Toth, Larry R. Kellogg, Eunice. L. Lau, Kyong J. Lee, arXiv:gr-qc/0512121 Int. J. Mod. Phys. D15 (2006) 1, 1-56, DOI: 10.1142/S0218271806008218
- Tensor manipulation in GPL Maxima, Viktor T. Toth, arXiv:cs/0503073
- A rapid solution of Rubik's Cube (
*A bűvös kocka egy gyors rendezése*), Viktor Tóth, Középiskolai Matematikai Lapok (Mathematical Journal for Secondary Schools) 60:5 198-200 (1980)

(See also my papers on the ADS, my Perimeter Institute page and its cached archive version, and my Google Scholar page.)

## Articles

Some of my answers on Quora were featured online by *Forbes Magazine*, *The Huffington Post*, *Apple News* and other media outlets. I also wrote a couple of articles for non-peer reviewed magazines:

- Does Anything Other Than Light Travel At The Speed Of Light?, Forbes Tech, July 2, 2018; also as Does Anything Travel Faster Than Light?, Apple News, July 6, 2018
- Will There Ever Be Cell Phones That Don't Emit Radiation?, Forbes Tech, June 8, 2018; also as Will There Ever Be Cell Phones That Don't Emit Radiation?, Apple News, June 12, 2018
- How Do We Know The Universe Is Infinite?, Forbes Tech, May 23, 2018; also as Is the Universe Infinite?, Apple News, May 23, 2018
- What Does It Mean When Particles Are 'Entangled'?, Forbes Tech, April 10, 2018; also as A Simple Explanation of Quantum Entanglement, Apple News, April 18, 2018
- Will Quantum Physics Ever Replace the Theory of Relativity?, Apple News, February 28, 2018
- What's Wrong With Newtonian Gravity?, Forbes Tech, February 8, 2018; also as Why Aren't Newtonian Gravity and General Relativity Compatible?, Apple News, February 8, 2018
- Why Are Hydrogen And Helium The Most Abundant Elements In The Universe?, Forbes Tech, January 29, 2018; also as Why Are Hydrogen and Helium the Most Abundant Elements?, Apple News, January 31, 2018
- How Accurate Is the Term ‘Theory of Everything’ in Physics?, Huffington Post, January 10, 2018; also as What Does The 'Theory Of Everything' Really Mean In Physics?, Forbes Tech, January 10, 2018
- How Do We Know There Are Black Holes?, Huffington Post, January 3, 2018; also as Are There Any Gaps In Black Hole Theory?, Forbes Tech, January 8, 2018; and as How Do We Know That Black Holes Are Really Real?, Apple News, January 27, 2018
- What’s Missing From the Big Bang Theory?, Huffington Post, December 22, 2017; also as Is The Big Bang Theory Incomplete?, Forbes Tech, December 26, 2017; and as What's Missing From the Big Bang Theory?, Apple News, January 25, 2018
- How Do Quantum Fields Relate to the Way We Experience Everyday Life?, Apple News, December 19, 2017; also as What Is A Quantum Field, And How Does It Interact With Matter?, Forbes Tech, December 20, 2017; and as Think Quantum Fields Are Confusing? They’re What We’re Accustomed to Calling Matter, Huffington Post, December 20, 2017
- How Cold Is Outer Space?, Forbes Tech, November 30, 2017; also as Exactly How Cold Is Space?, Huffington Post, November 29, 2017
- Does Time Really Exist? According To Physics, That's The Wrong Question Entirely, Forbes Tech, November 28, 2017; also as Does Modern Physics Prove That Time is An Illusion?, Huffington Post, November 28, 2017
- Why Are Photons Considered Particles?, Forbes Tech, November 14, 2017; also as Are Photons Particles or Electromagnetic Waves? How Can They Be Both?, Huffington Post, November 14, 2017
- Do Seemingly Unsolvable Science Questions Point to a Supernatural Force?, Huffington Post, October 26, 2017; also as What We Know (And Don't Know) About The Very Beginning Of The Universe, Forbes Tech, November 3, 2017
- How Does a Gaseous Sun Have Gravitational Pull on Solid Planets?, Huffington Post, October 9, 2017; also as The Sun Is Not Solid But Its Gravitational Pull On Earth Is Unaffected, Here's Why, Forbes Tech, October 10, 2017; and as How Does the Sun Have Gravitational Pull on Planets When It Is All Gas?, Apple News, January 20, 2018
- What Existed Before the Big Bang?, Huffington Post, October 4, 2017; also in Forbes Tech online, October 5, 2017; and as What Was There Before the Big Bang?, Apple News, April 23, 2018
- Would The Universe Still Exist If No Life Existed To Observe It?, Forbes Tech online, September 25, 2017; also as Would the Universe Exist If There Was No One to Observe It?, Huffington Post, September 25, 2017; and as Would the Universe Exist If We Didn't Observe It?, Apple News, January 13, 2018
- What Causes Cosmic Voids?, Forbes Tech online, September 12, 2017; also as Why is There So Much Empty Space in Space?, Huffington Post, September 13, 2017; also as What Causes Cosmic Voids?, Apple News, January 4, 2018
- Does The Universe Have Physical Boundaries?, Forbes Tech online, August 29, 2017; also as Does the Universe Have Physical Boundaries?, Huffington Post, August 30, 2017; and as Does the Universe Have Observable Boundaries?, Apple News, December 16, 2017
- Theoretical Physics Is More Important To Everyday Life Than Most People Think, Forbes Tech online, July 19, 2017; also as Why Should Normal People Bother Learning About Theoretical Physics?, Huffington Post, July 20, 2017; and as Modern Life's Practicalities Are Built on a Foundation of Theoretical Physics, Apple News, August 16, 2017
- Is There Anything That Can Travel Faster Than Light?, Forbes Tech online, July 13, 2017; also as Why Can't Anything Move Faster Than the Speed of Light?, Huffington Post, July 11, 2017; and as Is It True That Nothing is Faster Than Light?, Apple News, August 8, 2017
- Why Does Our Sun – a White Star – Appear to Be Orange?, Huffington Post, June 26, 2017; also as Our Sun Is A White Star, So Why Does It Appear Orange?, Forbes Tech online, June 27, 2017; as What Makes the Sun Appear Orange?, Apple News, July 3, 2017; as Why Does the Sun Appear Orange, Mental Floss, July 7, 2017; and as Why Does the Sun Appear Orange, MSN, July 7, 2017
- Why Nuclear Reactor Meltdowns Create Radiation That Lasts For Centuries, Forbes Tech online, June 21, 2017; also as Nuclear Bombs and Nuclear Reactor Meltdowns Affect the Environment in Very Different Ways, Huffington Post, June 22, 2017
- If Time Freezes At The Edge Of A Black Hole, Could Someone Theoretically Live Forever?, Forbes Tech online, May 25, 2017; also as Is it Possible to Live Forever at the Edge of a Black Hole? Huffington Post, May 31, 2017; and as Since Time Freezes at the Edge of a Black Hole, Could You Live Forever There?, Apple News, June 4, 2017
- The Marriage Of Einstein's Theory Of Relativity And Quantum Physics Depends On The Pull Of Gravity, Forbes Tech online, May 17, 2017; also as Can Quantum Physics and Relativity Co-Exist?, Huffington Post, May 18, 2017; and as The Ongoing Conflict Between Einstein's Relativity and Quantum Physics, Apple News, May 23, 2017
- Why Do General Relativity And Quantum Mechanics Need To Be Unified?, Forbes Tech online, April 13, 2017; also as Why Is It Important to Reconcile Quantum Mechanics and General Relativity?, Huffington Post, April 14, 2017
- A History Of The Scientific Understanding Of Heat, Forbes Tech online, March 31, 2017; also as The Scientific Theory That Failed Combustion Engine Advancement, Huffington Post, April 3, 2017
- Will The Sun Become A Black Hole When It Dies?, Forbes Tech online, March 20, 2017; also Huffington Post, March 21, 2017
- Why Is the Speed Of Light Considered The Cosmic Speed Limit?, Forbes Tech online, March 13, 2017
- Why Can't Scientists Find Planet 9?, Viktor T. Toth, Forbes Tech online, January 31, 2017
- If Energy Can't Be Created Or Destroyed, Why Can We Use It?, Viktor T. Toth, Forbes Tech online, January 4, 2017
- How Astronomers 'See' Cosmic Events From 12 Billion Years Ago, Viktor T. Toth, Forbes Tech online, December 27, 2016
- Why Einstein's elegant theory of relativity has stood the test of time, Viktor T. Toth, Forbes Tech online, December 2, 2016
- Nobody has proved Einstein wrong about relativity, but people are still trying, Viktor T. Toth, Forbes Tech online, November 30, 2016
- Is theoretical physics a waste of resources?, Viktor T. Toth, Forbes Tech online, September 14, 2016
- Are we alone in the Universe?, Viktor T. Toth, Forbes Tech online, July 19, 2016
- Finding the Source of the Pioneer Anomaly, Viktor T. Toth and Slava G. Turyshev, IEEE Spectrum, December 2012 (
**cover story**) - Study of the Pioneer Anomaly: A scientific detective story, Viktor T. Toth, arXiv:0903.0075 [physics.space-ph], invited article in The Postgraduate Magazine 2007;1:24-30 (School of Mathematics and Statistics, University of Newcastle Upon Tyne)

## Talks

I have attended several conferences and gave talks at other venues. Here are some select presentations:

- TianQin - Spacecraft Navigation and Mission Simulation, talk given at the 3rd TianQin workshop in Guangzhou, China, on December 9, 2015
- Cosmological consequences of Modified Gravity (MOG), talk given at the International Conference on Two Cosmological Models, Universidad Iberoamericana, Ciudad de México, November 17-19, 2010
- My Pioneer anomaly presentations, including
- My Pioneer anomaly talk given at The Perimeter Institute on April 4, 2013
- My Pioneer anomaly colloquium, given at Carleton University, Ottawa, on September 18, 2012.
- My Pioneer seminar presentation at the Perimeter Institute on May 27, 2011, also with video.
- Background notes on the thermal recoil force, presented on my behalf by Slava Turyshev at the third Pioneer Explorer Collaboration Team Meeting at ISSI, Bern, Switzerland, February 18-22, 2008.
- My independent analysis of Pioneer Doppler data, my analysis of Pioneer 10 and 11 telemetry, and my thermal analysis of the Pioneer 10 and 11 spacecraft, presented at the second Pioneer Explorer Collaboration Team Meeting at ISSI, Bern, Switzerland, February 19-23, 2007.
- My Pioneer anomaly lecture, given at Carleton University, Ottawa, on October 16, 2006.
- My presentation on the Pioneer spacecraft and the recovered telemetry, presented at the first Pioneer Explorer Collaboration Team Meeting at ISSI, Bern, Switzerland, November 7-11, 2005.

- Humidification requirements in economizer-type HVAC systems, ASHRAE Winter Conference, Dallas, TX, Jan 30, 2013