Comparison of technical and physiological characteristics of prepubescent soccer players of different ages - Fernandez-Gonzalo, R.; de Souza-Teixeira, F.; Bresciani, G.; Garcia-Lopez, D.; Hernandez-Murua, J. A.; Jimenez-Jimenez, R.; de Paz, J. A. (The Journal of Strength and Conditioning Research, 2010)