IrgashevB. Yu. “On Partial Solutions of One Equation With Multiple Characteristics and Some Properties of the Fundamental Solution”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 6 (June 25, 2016): 763-787. Accessed December 9, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1877.