B. Shanmugapriya, K. Ramesh, and S. Chitra. “$IF\alpha^{**}g$ Closed Sets in Intuitionistic Fuzzy Topological Spaces”. International Journal of Mathematics And Its Applications, vol. 6, no. 1 - A, Jan. 2018, pp. 63-71, http://ijmaa.in/index.php/ijmaa/article/view/898.