STATKEVYCH, V. M. Investigation of solutions of boundary-value problems with essentially infinite-dimensional elliptic operator. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 2, p. 229–236, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2569. Acesso em: 7 apr. 2025.