Bohdan Iosypovych Ptashnyk

Gorbachuk M. L., Luchka A. Y., Mitropolskiy Yu. A., Samoilenko A. M.

English version (Springer): Ukrainian Mathematical Journal 49 (1997), no. 9, pp 1297-1298.

Citation Example: Gorbachuk M. L., Luchka A. Y., Mitropolskiy Yu. A., Samoilenko A. M. Bohdan Iosypovych Ptashnyk // Ukr. Mat. Zh. - 1997. - 49, № 9. - pp. 1155–1156.

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