On a Linear Partial Differential Equation of the Higher Order in Two Variables with Initial Condition Whose Coefficients are Real-valued Simple Step Functions. Journal of Partial Differential Equations, [S. l.], v. 29, n. 1, p. 1–13, 2016. DOI: 10.4208/jpde.v29.n1.1. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/14961. Acesso em: 5 dec. 2025.