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Zur Raumwirksamkeit der Integration in Osteuropa
Förster, Horst, (1980)
East European economies post-Helsinki : a compendium of papers submitted to the Joint Economic Committee, Congress of the United States
(1977)
Die Tschechoslowakei und die wirtschaftliche Integration Osteuropas
Turecek, Otto, (1958)
The interaction between nature and society, and economic geography
Zhirmunskiy, M. M., (1966)