ZADOROZHNA, N. M.; MEL'NYK, O. M.; PTASHNIK, B. I. Nonlocal boundary-value problem for parabolic equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 12, p. 1621–1626, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5573. Acesso em: 5 dec. 2025.