Liu, Zhi-Qin, Evgenij Dorozhkin, Nataliia Davydova, and Nadezhda Sadovnikova. 2020. “Retracted Article: Co-Learning As a New Model of Learning in a Digital Environment: Learning Effectiveness and Collaboration”. International Journal of Emerging Technologies in Learning (iJET) 15 (13):pp. 34-48. https://doi.org/10.3991/ijet.v15i13.14667.