Brownian motion in a euclidean space with a membrane located on a given hyperplane von B. I. Kopytko, M. I. Portenko

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On Feller semigroups associated with one-dimensional diffusion processes with membranes von B. I. Kopytko, R. V. Shevchuk

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On pasting together two inhomogeneous diffusion processes on a line with the general Feller–Wentzell conjugation condition von B. I. Kopytko, R. V. Shevchuk

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A teacher who is always near (to the 80th anniversary of Corresponding Member of NAS of Ukraine M.I. Portenko) von O. V. Ariasova, B. I. Kopytko, M. M. Osypchuk

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Mykola Ivanovych Portenko (on his 75th birthday) von B. I. Kopytko, M. M. Osypchuk, A. A. Dorohovtsev

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