Gal, M. M. “Approximate Solution of Integral Equations With Delayed Argument by Y. D. Sokolov’s Method ”.
Ukrains’kyi Matematychnyi Zhurnal 18, no. 6 (October 27, 1966): 102–107. Accessed April 7, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/8463.