Hartsell H, Spaulding S. Eccentric/concentric ratios at selected velocities for the invertor and evertor muscles of the chronically unstable ankle. 1999: 33: 255-258.
Tropp H. Pronator muscle weakness in functional instability of the ankle joint. Int J Sports Med. 1986: 7: 291-294.
J Karlsson, L Peterson. Evaluation of ankle joint function; the use of a scoring scale. 1991: 1: 15-19.
Prop R, Herbert R, et al. Effects of ankle dorsiflexion range and pre-exercise calf muscle stretching on injury risk in army recruits. Aust J Physiother. 1998: 44: 165-172.