[1]
A. M. Samoilenko, A. A. Berezovsky, and K. K. . Zhemukhov, “School-seminar ‘Nonlinear boundary value problems of mathematical physics and their applications’”, Ukr. Mat. Zhurn., vol. 42, no. 6, pp. 864–865, Jun. 1990, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8856