TIMOKHA, A. On the variational statement of one boundary-value problem with free interface. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 8, p. 1113–1118, 2023. DOI: 10.3842/umzh.v75i8.7650. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7650. Acesso em: 7 dec. 2025.