Evaluation of experience of distance-learning that was provided by Greek Public Institutes of Vocational Training (PIVT) during the pandemic COVID-19 crisis. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 108, p. 5–15, 2021. DOI: 10.60063/gsu.fmi.108.5-15. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/553. Acesso em: 14 dec. 2025.