IL'KIV, V. S.; VOLYANSKA, I. I.; SYMOTYUK, M. M. Nonlocal boundary-value problem for a second-order partial differential equation in an unbounded strip. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 10, p. 1374–1381, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1641. Acesso em: 7 apr. 2025.