GAO, X.; XING, Q. Monotonicity Properties of the First Eigenvalue of the Laplacian Operator on Ricci Solitons. Journal of Informatics and Mathematical Sciences, [S. l.], v. 4, n. 2, p. 219–227, 2012. DOI: 10.26713/jims.v4i2.85. Disponível em: https://www.rgnpublications.com/journals/index.php/jims/article/view/85. Acesso em: 4 may. 2024.