BerezovskyA. A., MitropolskiyYu. A., and NetesovaT. M. “On One Nonlocal Problem With Free Boundary”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 7 (July 25, 2001): 908-918. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4312.