1. East European GNPs, domestic final uses of gross product, rates of growth and international comparisons;Alton,1989
2. Economic growth in Eastern Europe, 1975–1990;Alton,1991
3. GNP/capita estimates for European CPEs: Alternative approaches, evaluation and recommendations;Bhanoji,1979
4. Handbook of Economic Statistics 1991;Central Intelligence Agency (CIA),1991
5. Comparative GDP levels;Economic Commission for Europe (ECE);Economic Bulletin for Europe,1980