“An Inverse Problem for a Weakly Nonlinear Ultraparabolic Equation With Three Unknown Functions of Different Arguments in the Right-Hand Side”. Neliniini Kolyvannya 18, no. 2 (June 29, 2015): 245–279. Accessed April 12, 2026. https://nosc.imath.kiev.ua/index.php/nosc/article/view/785.