Crăciun, Maria. “On an Approximation Operator and Its Lipschitz Constant”. Rev. Anal. Numér. Théor. Approx. 31, no. 1 (February 1, 2002): 55–60. Accessed November 25, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2002-vol31-no1-art7.