Generalized inversion of operator matrices (generalization of the Frobenius theorem). Neliniini Kolyvannya, [S. l.], v. 26, n. 1, p. 42–54, 2023. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1089. Acesso em: 6 dec. 2025.