2Brantlcy Liddle, "Free Trade and the Environment - development System", Ecological Economics, 39(2001): 21 - 36.
3Brian R. Copeland, M. scott Taylor, "Trade, Spatial Separation,and the Env ironment",Journal of International Economics, 47(1999):137 - 168.
4Lopez, R., "The Environment as a Factor of Production: The Effects of Economic Growth and Trade Liberalization ", Journal of Environmental Economics and Management, 27(1994): 63 - 184.
5Michael Benarroch, Henry Thille,"Transboundary and the gains from trade", Journal of International Economics, 55(2001 ):139 - 159.
6McGuire, M. C. "Regulation, Factor Rewards and International Trade", Journal of Public Econonics, 17 (1982): 335 - 354.