Redefining dropping out in online higher education: a case study from the UOC. - Josep Grau-Valldosera; Julià Minguillón (LAK, 2011)

Visualization of Enrollment Data using Chord Diagrams. - Laia Blasco-Soplón; Josep Grau-Valldosera; Julià Minguillón (GRAPP, 2015)

Returning after taking a break in online distance higher education: from intention to effective re-enrollment. - Josep Grau-Valldosera; Julià Minguillón; Anabel Blasco-Moreno (Interact. Learn. Environ., 2019)