Orbán, B., and F. Radó. “Nomograms With Minimal Global Error”. Anal. Numér. Théor. Approx. 6, no. 2 (August 1, 1977): 163–170. Accessed April 11, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1977-vol6-no2-art8.