Maruniak, Eugenia Lisovskyi, Sergiy Rudenko, Leonid
Symposium of the Commission on International Division of Labour and Regional Development, International Geographical Union (1987 ; Szymbark)
Rudenko, Leonid Lisovsky, Sergiy Maruniak, Eugenia Farion, Yuriy
Conference on Economic Regionalization (1959 ; Kazimierz Dolny)