Pitolli, Francesca. “Bases for Shape Preserving Curves”.
Rev. Anal. Numér. Théor. Approx.
32, no. 1 (February 1, 2003): 85–97. Accessed April 14, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/2003-vol32-no1-art10
.