Patro, M., S. Kumar Paikray, and H. Dutta. “Statistical Deferred Euler Summability Mean and Associated Korovokin-Type Approximation Theorem”. Science & Technology Asia, Vol. 25, no. 1, Mar. 2020, pp. 31-37, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/240316.