Vasylyshyn, P. B.; Vlasiĭ, O. D.; Goĭ, T. P.; Zagorodnyuk, A. V.; Zators’kyĭ, R. A.; Kazmerchuk, A. I.; Kopach, M. I.; Mazurenko, V. V.; Makhneĭ, O. V.; Malyts’ka, G. P.; Nykyforchyn, O. R.; Osypchuk, M. M.; Pylypiv, V. M.; Savka, I. Ya.; Symotyuk, M. M.; Filevych, P. V.; Sharyn, S. V. Bogdan Yosypovych Ptashnyk (obituary). (Ukrainian) Zbl 1372.01067 Carpathian Math. Publ. 9, No. 1, 104-106 (2017). MSC: 01A70 Biographies, obituaries, personalia, bibliographies Biographic References: Ptashnyk, Bogdan Ĭosypovych PDFBibTeX XMLCite \textit{P. B. Vasylyshyn} et al., Carpathian Math. Publ. 9, No. 1, 104--106 (2017; Zbl 1372.01067) Full Text: DOI Link