Liu, Hai, and Kung-Sik Chan. “Introducing COZIGAM: An R Package for Unconstrained and Constrained Zero-Inflated Generalized Additive Model Analysis”. Journal of Statistical Software 35, no. 11 (July 26, 2010): 1–26. Accessed November 21, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v035i11.