Kaufmann, Daniel Integrating the unofficial economy into the dynamics of post-socialist economies: a framework of analysis and evidence by Daniel Kaufmann and Aleksander Kaliberda - Washington, D.C. World Bank 1996 - 39p. - Policy research working paper 1691 . Subjects--Topical Terms: Informal sector (Economics) --Former Soviet republicsInformal sector (Economics) --Europe, CentralInformal sector (Economics) --Europe, Eastern