@article{{ER}{}, author = {Duy, P., Hiep, P.}, title = { Online Classrooms in the Digital Era - Online Presence Through Learners’ Perception}, journal = {VNU Journal of Science: Education Research}, volume = {38}, number = {1}, year = {2022}, doi = {10.25073/2588-1159/vnuer.4595}, url = {https://js.vnu.edu.vn/ER/article/view/4595} }