Shyam Kishor, Pushpendra Verma, and Puneet Kumar Gupt. 2017. “On $W_{9}-$Curvature Tensor of Generalized Sasakian-Space-Forms”. International Journal of Mathematics And Its Applications 5 (4 - A):103-12. http://ijmaa.in/index.php/ijmaa/article/view/1244.