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- HADRABOVÁ, Alena. Vývoj řízení péče o životní prostředí v Československu v letech 1945-1989. In Acta Oeconomica Pragensia, 1995, roč. 3, č. 4, s. 29-37.
- LAZARCIK, Gregor. Bulgarian Agricultural Production, Output, Expenses, Gross and Net Product, and Productivity, at 1968 Prices, 1939 and 1948-1970. 1. ed. New York : Economic Studies Riverside Research Institute, 1973. 61 s. Occasional Papers of the Research Project on National Income in East Central Europe, 39. [Copy count : 1, currently available 1, at library only 0]