Effects of specific hip muscle activation exercise using realt-time biofeedback on dynamic knee control in jumping performance in female athletes: Results of a pilot study - Hajduk, K.; Rebtschinski, J.; Schlumberger, A.; Schmidtbleicher, D. (19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. - 5. July 2014, 2014)