Lal, S., and V.K. Sharma. “On the Estimation of Functions Belonging to Lipschitz Class by Block Pulse Functions and Hybrid Legendre Polynomials”. Carpathian Mathematical Publications 12, no. 1 (June 12, 2020): 111-128. Accessed September 22, 2020. https://journals.pnu.edu.ua/index.php/cmp/article/view/3891.