LEANDRO, B.; DOS SANTOS, J. P. Reduction of gradient Ricci soliton equations. Annales Fennici Mathematici, [S. l.], v. 45, n. 2, p. 1003–1011, 2020. DOI: 10.5186/aasfm.2020.4554. Disponível em: https://afm.journal.fi/article/view/135897. Acesso em: 20 may. 2024.