Willems, T., Witvrouw, E., Verstuyft, J., Vaes, P. ., & De Clercq, D. (2002). Proprioception and muscle strength in subjects with a history of ankle sprains and chronic instability. Journal of athletic training, 37(4), S. 487-493. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC164382/pdf/attr_37_04_0487.pdf

Willems, Tine, Erik Witvrouw, Jan Verstuyft, Peter Vaes, and Dirk De Clercq. "Proprioception and Muscle Strength in Subjects With a History of Ankle Sprains and Chronic Instability." Journal of Athletic Training 37, no. 4 (2002): S. 487-493.

Willems, Tine, et al. "Proprioception and Muscle Strength in Subjects With a History of Ankle Sprains and Chronic Instability." Journal of Athletic Training 37.4 (2002): S. 487-493.