Liu Z-Q, Dorozhkin E, Davydova N, Sadovnikova N. Retracted Article: Co-Learning as a New Model of Learning in a Digital Environment: Learning Effectiveness and Collaboration. Int. J. Emerg. Technol. Learn. [Internet]. 2020 Jul. 10 [cited 2024 May 3];15(13):pp. 34-48. Available from: https://online-journals.org/index.php/i-jet/article/view/14667