Team, S. “On Lp−Inverse Theorem for a Linear Combination of Szasz-Beta Operators: P.N. Agrawal, Asha Ram Gairola”. Thai Journal of Mathematics, vol. 8, no. 3, Dec. 2010, pp. 429-38, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/211.