KANGUZHIN, B.; ZHAPSARBAYEVA, L.; MADIBAIULY, Z. Lagrange formula for differential operators and self-adjoint restrictions of the maximal operator on a tree . Eurasian Mathematical Journal, [S. l.], v. 10, n. 1, p. 16–29, 2019. DOI: 10.32523/2077-9879-2019-10-1-16-29. Disponível em: https://emj.enu.kz/index.php/main/article/view/137. Acesso em: 30 sep. 2026.