1.
Kmit IY, Ptashnik BI. Well-posedness of boundary-value problems for multidimensional hyperbolic systems. Ukr. Mat. Zhurn. [Internet]. 2008Feb.25 [cited 2024Apr.25];60(2):192–203. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3149