Instructor presence in online teaching: challenges and opportunitiesTatiana Leonidovna Kopus, Elena Sergeevna Mikhalat, Ekaterina Yurievna Belozerova and Olga Vladimirovna MeshcheryakovaSHS Web Conf., 127 (2021) 03002DOI: https://doi.org/10.1051/shsconf/202112703002
