KhachatryanA. Kh., and KhachatryanKh. A. 2011. “On the Construction of a Nonnegative Solution for One Class of Urysohn-Type Nonlinear Integral Equations on a Semiaxis”. Ukrains’kyi Matematychnyi Zhurnal 63 (1), 110-18. https://umj.imath.kiev.ua/index.php/umj/article/view/2702.