Martínez-Carrascal, Juan Antonio, Martin Hlosta, and Teresa Sancho-Vinuesa. “Using Survival Analysis to Identify Populations of Learners at Risk of Withdrawal: Conceptualization and Impact of Demographics”. The International Review of Research in Open and Distributed Learning 24, no. 1 (February 1, 2023): 1–21. Accessed April 19, 2024. https://www.irrodl.org/index.php/irrodl/article/view/6589.