Przymuszała, A., and M. Gębska. “Evaluation of Hand Grip Strength and Range of Movement of the Upper Limb in Children With Polyarticular Hypermobility (PH)”. Journal of Education, Health and Sport, vol. 8, no. 1, Jan. 2018, pp. 128-3, https://apcz.umk.pl/JEHS/article/view/5234.