R. L. PATEL; R. N. SINGH. $\eta$-Ricci Solitons on $\beta$-Kenmotsu Manifolds. International Journal of Mathematics And its Applications, [S. l.], v. 9, n. 3, p. 129–138, 2021. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/53. Acesso em: 2 may. 2024.