[1]
Il’kiv V. S., Strap N. I., and Volyanska I. I., “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”, Ukr. Mat. Zhurn., vol. 72, no. 4, pp. 452-466, Mar. 2020.