Zhuravlyov V. Р. “Weakly Nonlinear Fredholm Integral Equations With Degenerate Kernel in Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 67, no. 11 (November 25, 2015): 1477–1490. Accessed April 16, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/2083.