Irgashev, B.Y. (2016) “On partial solutions of one equation with multiple characteristics and some properties of the fundamental solution”, Ukrains’kyi Matematychnyi Zhurnal, 68(6), pp. 763–787. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1877 (Accessed: 5 December 2025).