Sardaryan, T. G., Ts. E. Terjyan, and Kh. A. Khachatryan. 2017. “Sardaryan T. G. On the Solvability of One System of nonlinear Hammerstein-Type Integral Equations on the Semiaxis”. Ukrains’kyi Matematychnyi Zhurnal 69 (8), 1107-22. https://umj.imath.kiev.ua/index.php/umj/article/view/1762.