1.
Kalz M, Kreijns K, Walhout J, CastaƱo-Munoz J, Espasa A, Tovar E. Setting-up a European Cross-Provider Data Collection on Open Online Courses. IRRODL [Internet]. 2015Dec.3 [cited 2022Aug.16];16(6). Available from: https://www.irrodl.org/index.php/irrodl/article/view/2150