Calizaya-Lopez, J.; de la Vega-Calizaya, J. D.; Zapata-Delgado, F.; Cervantes-Rivera, R.; Alvarez-Salinas, L.; Aleman-Vilca, Y.; Miaury-Vilca, A. R.; Carita-Choquecahua, A. The Social Presence of University Students in Virtual Teaching-Learning Environments in Times of Covid-19. JHETP 2023, 23.