Nijkamp, P., and J. Paelinck. “Geometric Programming and Entropy Maximizing Models”. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science 14, no. 1 (August 1, 1974): 1–18. Accessed May 12, 2024. https://www.orbel.be/jorbel/index.php/jorbel/article/view/511.