MALOVICHKO , V. A. On solvability of nonlocal boundary value problems for certain sets of evolutionary differential         equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 2, p. 211–216, 2025. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9359. Acesso em: 7 dec. 2025.