9Viktor J. Vanberg and Roger D. Congleton, "Rationality, Morality, and Exit", American Political Science Review, Vol. 86, No. 2, 1992, pp. 418-431.
10Jack Donnelly, "Twentieth-Century Realsim", in Terry Nardin and David R. Mapel, eds., Traditions of International Ethics, Cambridge: Cambridge University Press, 1992, pp. 85-111.
