INITIAL BOUNDARY-VALUE PROBLEM FOR AN INHOMOGENEOUS MIXED-TYPE PARTIAL DIFFERENTIAL EQUATION WITH TWO DEGENERATION LINES. European Science Methodical Journal, [S. l.], v. 4, n. 6, p. 7–18, 2026. Disponível em: https://europeanscience.org/index.php/3/article/view/1764. Acesso em: 17 jun. 2026.