KOMARENKO, A. N.; TROTSENKO, V. A. Variational method for the solution of problems of transmission with the principal conjugation condition. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 6, p. 762–775, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4663. Acesso em: 14 apr. 2025.