Pavone, Pasquale, and Maria Francesca Romano. “Models of Text Mining to Measure Improvements to Doctoral Courses Suggested by ‘STELLA’ Phd Survey Respondents”. Statistica 73, no. 4 (January 1, 2013): 463–475. Accessed January 27, 2023. https://rivista-statistica.unibo.it/article/view/4500.