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References R-1 References Asphalt Pavement Alliance (APA), 2002. Perpetual Pavements: A Synthesis. APA 101, Lanham, Maryland. Colorado DOT (CDOT), 2011. http://www.coloradodot.info/programs/environmental. Accessed September 2011. Schmidheiny, S. and the Business Council for Sustainable Development, 1992. Changing Course: A Global Business Perspective on Development and the Environment, MIT Press, Cambridge, MA. World Commission on Environment and Development (Brundtland Commission), 1987. Our Common Future. Oxford University Press, Oxford.