Shrivastava, R., H. K. Nashine, and C. L. Dewangan. “INVARIANT RANDOM APPROXIMATION IN NONCONVEX DOMAIN”. Journal of the Indonesian Mathematical Society 15, no. 2 (May 7, 2012): 69–77. Accessed April 28, 2024. https://jims-a.org/index.php/jimsa/article/view/45.