Aldashev, S. A. “Well-Posedness of the Dirichlet and Poincare Problems for a Multidimensional Gellerstedt Equation in a Cylindric Domain”. Ukrains’kyi Matematychnyi Zhurnal 64, no. 3 (March 25, 2012): 426-432. Accessed April 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2587.