KURBATOV, V. G.; KURBATOVA, I. V. Krylov subspace methods of approximate solving differential equations from the point of view of functional calculus. Eurasian Mathematical Journal, [S. l.], v. 3, n. 4, p. 53–80, 2012. Disponível em: https://emj.enu.kz/index.php/main/article/view/807. Acesso em: 31 oct. 2025.