Kornai, János: The Socialist System. The Political Economy of Communism. Princeton: Princeton University Press and Oxford: Oxford University Press 1992; Kornai, János: Economics of Shortage. Munich: Elsevier 1980. A concise summary of Kornai's analysis can be found in Verdery, Katherine: Anthropology of Socialist Societies. In: International Encyclopedia of the Social and Behavioral Sciences, ed. Neil Smelser and Paul B. Baltes. Amsterdam: Pergamon Press 2002, available for download here [1].