SAMOILENKO, A. M.; BEREZOVSKY, A. A.; ZHEMUKHOV, Kh. K. School-seminar “Nonlinear boundary value problems of mathematical physics and their applications”. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 864–865, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8856. Acesso em: 5 dec. 2025.