Traets, Frits, Daniel Gil Sanchez, and Martina Vandebroek. “Generating Optimal Designs for Discrete Choice Experiments in R: The Idefix Package”. Journal of Statistical Software 96, no. 3 (November 29, 2020): 1–41. Accessed April 20, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v096i03.