Bianconcini, Silvia, Silvia Cagnone, Stefania Mignani, and Paola Monari. “A Latent Curve Analysis of Unobserved Heterogeneity in University Achievements”. Statistica 67, no. 1 (January 1, 2007): 55–67. Accessed December 3, 2022. https://rivista-statistica.unibo.it/article/view/3497.