Lakhan Singh, and Shailendra Kumar Gautam. “On Some Properties of Metric F-Structure Satisfying $F^{2k+1}+F=0$”. International Journal of Mathematics And Its Applications, vol. 5, no. 2 - A, Apr. 2017, pp. 63-66, https://ijmaa.in/index.php/ijmaa/article/view/796.