Abbakumov, D.D.AbbakumovDesmet, PietPietDesmetVan den Noortgate, WimWimVan den Noortgate2021-10-282021-10-2820202054-670Xhttps://imec-publications.be/handle/20.500.12860/34580Psychometrics of MOOCs: Measuring learners' proficiencyJournal articlehttp://doi.org/10.5334/pb.515