Ibraeva, G. T., and M. I. Tleubergenov. “Main Inverse Problem for Differential Systems With Degenerate Diffusion”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 5 (May 25, 2013): 712–716. Accessed June 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2454.