Avramova, N. , Mihaylova , I. , Yaneva-Ribagina, K., Bonev , B. and Nenov , S. 2021. DENTAL STUDENTS’ PERSPECTIVES ON THE IMPLEMENTATION AND EFFECTIVENESS OF ONLINE LEARNING DUE TO COVID-19 PANDEMIC: A DESCRIPTIVE CROSS-SECTIONAL STUDY IN BULGARIA. Advanced Education. 8, 18 (Jul. 2021), 109–118. DOI:https://doi.org/10.20535/2410-8286.231011.