CHUDINOVICH, I. Yu. Properties of nonstationary boundary operators in a full scale of Sobolev-type spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 7, p. 962–965, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5691. Acesso em: 6 dec. 2025.