P. Sathishmohan, V. Rajendran, and P. Jeevitha. “On $\pi g^\ast$s-Irresolute Functions in Topological Spaces”. International Journal of Mathematics And Its Applications, vol. 6, no. 2 - A, May 2018, pp. 201-7, https://ijmaa.in/index.php/ijmaa/article/view/664.