Petrushko Igor Meletievich (on the occasion of his 75th birthday)

V. E. Fedorov^a, I. E. Egorov^a, A. I. Kozhanov^bc, S. V. Popov<sup>a

a</sup> M. K. Ammosov North-Eastern Federal University
^b Sobolev Institute of Mathematics
^c Novosibirsk State University

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