KONSTANTINOV, A. Yu.; KONSTANTINOV, O. Sturm-Liouville operators with matrix distributional coefficients. Methods of Functional Analysis and Topology, [S. l.], v. 23, n. 1, p. 51–59, 2017. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/653. Acesso em: 16 dec. 2025.