Xie, Shao-Ming. “Comparative Models in Customer Base Analysis: Parametric Model and Observation-Driven Model”. Journal of Business Economics and Management 21, no. 6 (October 19, 2020): 1731-1751. Accessed November 23, 2024. https://jbem.vgtu.lt/index.php/JBEM/article/view/13194.