Cui, Min, Anika Frühauf, Anne Kerstin Reimers, Yolanda Demetriou, and Claus Krieger. 2025. “The Positive and Negative Impact of Online Social Ties on PA Behaviour: A Qualitative Analysis in Chinese Adolescents”. Journal on Efficiency and Responsibility in Education and Science 18 (3):219–228. https://doi.org/10.7160/eriesj.2025.180306.