Kolyvas, Georgios, Chrystostomos Logaras, Dimitrios Kotsifakos, and Christos Douligeris. 2024. “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 (2):21-27. https://ejournals.epublishing.ekt.gr/index.php/jiim/article/view/37895.