Dewulf, Bart, Tijs Neutens, Delfien Van Dyck, Ilse De Bourdeaudhuij, Steven Broekx, Carolien Beckx, and Nico Van de Weghe. “Associations Between Time Spent in Green Areas and Physical Activity Among Late Middle-Aged Adults”. Geospatial Health 11, no. 3 (November 16, 2016). Accessed March 29, 2024. https://www.geospatialhealth.net/gh/article/view/411.