Belopol’skayaY. I. (1997) “A priori estimates for solutions of the first initial boundary-value problem for systems of fully nonlinear partial differential equations”, Ukrains’kyi Matematychnyi Zhurnal, 49(3), pp. 338–363. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5012 (Accessed: 24November2024).