Олейник, Е.В. 2015. The study of solutions of a class of nonlinear systems. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 82, (Dec. 2015), 34-46. DOI:https://doi.org/10.26565/2221-5646-2015-82-04.