STOROZH, O. G. On the conditions of solvability and the resolvent of a second-order deferential boundary operator in a space of vector functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 4, p. 517–524, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5450. Acesso em: 5 dec. 2025.