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Il’kiv, .V.S. et al. 2020. Solvability conditions of a nonlocal boundary value problem for a differential-operator equation with nonlinearity in a refined Sobolev scale of spaces of functions of several real variables.
Ukrains’kyi Matematychnyi Zhurnal. 72, 4 (Mar. 2020), 452–466. DOI:
https://doi.org/10.37863/umzh.v72i4.2270.