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Petro, Andrew. "Effect of Gravity on Humans." NASA.gov. 1999. 4 Dec. 2003. <http://quest.arc.nasa.gov/mars/ask/humans-on-mars/Effect_of_Gravity_on_Humans.txt>
Living on Mars
Robbins, Tom. "In Defiance of Gravity: Writing, Wisdom, and the Fabulous Club Gemini." Harper's Magazine. 2004 Find Articles Online. Site Accessed February 13, 2005.
"In Defiance of Gravity"
Wald, Robert M. Space, Time and Gravity: the Theory of the Big Bang and Black Holes. Chicago: University of Chicago, 1992.
The Big Bang Theory
Deardorff, AV. 1998. Determinants of Bilateral Trade: Does Gravity Work in a Neoclassical World? In The Regionalization of the World Economy, ed. Jeffrey A. Frankel. Chicago: University of Chicago Press. Pp. 7-22.
Trade Patterns of the U.S. and China
Di Mauro, Francesca - The Impact of Economic integration on FDI and Exports: A Gravity Approach. Working Document No 156, Center for European Policy Studies, Nov 2000.
Multilateral Protection to Investments
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