1. [1] Cabrerizo, J.L., Fernandez, M. Gomez, J.S.: Isotropic submanifolds of pseudo-Riemannian spaces. Journal of Geometry and Physics. 62, 1915-
1924 (2012).
2. [2] Chen, B.Y.: Pseudo-Riemannian geometry, δ-invariants and applications, World Scientific. Singapore (2011).
3. [3] Chen, B.Y.: Complex extensors and Lagrangian submanifolds in indefinite complex Euclidean spaces, Bulletin of the Institute of Mathematics
Academia Sinica. 31 (3), 151-179 (2003).
4. [4] Ciobanu, A., Mirea, M.: New inequalities on isotropic spacelike submanifolds in pseudo-Riemannian space forms. Romanian Journal of
Mathematics and Computer Science. 11 (2), 48-52 (2021).
5. [5] Deng, S.: An improved Chen-Ricci inequality, International Electronic Journal of Geometry. 2 (2), 39-45 (2009).