Kharibegashvili, S.S. and Midodashvili, B.G. 2022. Boundary-value problem for a class of nonlinear systems of partial differential equations of higher orders. Ukrains’kyi Matematychnyi Zhurnal. 74, 6 (Jul. 2022), 856 - 868. DOI:https://doi.org/10.37863/umzh.v74i6.6968.