YAGDJIAN, Karen. Introduction to Nonlinear Hyperbolic Partial Differential Equations. Armenian Journal of Mathematics, Yerevan, Armenia, v. 3, n. 3, p. 70 pages, 2011. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/76. Acesso em: 3 apr. 2025.