Wurm, Michael J., Paul J. Rathouz, and Bret M. Hanlon. “Regularized Ordinal Regression and the OrdinalNet R Package”. Journal of Statistical Software 99, no. 6 (September 8, 2021): 1–42. Accessed April 20, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v099i06.