Lu, Wen-ming, and Jin-ping Jia. “Another Weighted Approximation of Functions With Singularities by Combinations of Bernstein Operators”. Journal of Progressive Research in Mathematics 5, no. 3 (October 9, 2015): 561-577. Accessed May 19, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/385.