Raşa, Ioan. “Iterated Boolean Sums of Bernstein and Related Operators”. Rev. Anal. Numér. Théor. Approx. 35, no. 1 (February 1, 2006): 111–115. Accessed December 4, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2006-vol35-no1-art15.