Comparison of the effect of repeated-sprint training combined with two different methods of strength training on young soccer players - Campos-Vazquez, M. A.; Boza, S. R.; Toscano-Bendala, F. J.; Leon-Prados, J. A.; Suarez-Arrones, L.; Gonzalez-Jurado, J. A. (The Journal of Strength and Conditioning Research, 2015)