Аbiev N.А. On classification of degenerate singular points of Ricci flows. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 79, n. 3, p. 3–11, 2015. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/39. Acesso em: 10 jul. 2025.