Kolyvas, Georgios, Chrystostomos Logaras, Dimitrios Kotsifakos, and Christos Douligeris. “Difficulties and Problems in the Implementation Phase of an Open Online Personalized Learning Environment for Vocational Education and Training for the Covid-19 Period”. Journal of Integrated Information Management 6, no. 2 (May 26, 2024): 21–27. Accessed November 23, 2024. https://ejournals.epublishing.ekt.gr/index.php/jiim/article/view/37895.