Urinov A. K., and Okboev A. B. “Modified Cauchy Problem for One Degenerated Hyperbolic Equation of the Second Kind”. Ukrains’kyi Matematychnyi Zhurnal 72, no. 1 (January 15, 2020): 100-118. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/656.