1.
Andrusyak R, Kyrylych V, Peliushkevych О. A problem for degenerated semilinear hyperbolic system in sector. Carpathian Math. Publ. [Internet]. 2011 Dec. 29 [cited 2024 May 3];3(2):4–12. Available from: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/3060