AMIROV, R. Kh.; YURKO, V. A. On differential operators with singularity and conditions of discontinuity inside an interval. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 11, p. 1443–1457, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4364. Acesso em: 6 dec. 2025.