Vedøy, I., K. Skulberg, H. Tjomsland, S. Anderssen, and M. Thurston. “Physical Activity and Mental Health Among Adolescents in Norway; A Longitudinal Study: Oral Presentation B14.2”. The Health & Fitness Journal of Canada, vol. 14, no. 3, Sept. 2021, doi:10.14288/hfjc.v14i3.583.