On the approximate solution of matrix differential-algebraic boundary-value problems by the least square method. Neliniini Kolyvannya, [S. l.], v. 22, n. 3, p. 423–436, 2019. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/960. Acesso em: 21 jan. 2026.