Nonlocal Solvability of the Cauchy Problem for a System with Negative Functions of the Variable $t$. Armenian Journal of Mathematics, [S. l.], v. 15, n. 4, p. 1–10, 2023. DOI: 10.52737/18291163-2023.15.4-1-10. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/793. Acesso em: 4 dec. 2024.