Abdikalikova, G. A., A. B. Berzhanov, and K. K. Kenzhebaev. “Multiperiodic Solution of a Boundary-Value Problem for One Class of Parabolic Equations With Multidimensional Time”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 5 (May 25, 2014): 645–655. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2166.