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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 49, No. 9, pp. 1155–1156, September, 1997.
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Gorbachuk, M.L., Luchka, A.Y., Mitropol'skii, Y.A. et al. Bohdan Iosypovych Ptashnyk. Ukr Math J 49, 1297–1298 (1997). https://doi.org/10.1007/BF02487335
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DOI: https://doi.org/10.1007/BF02487335