Evolution of the relative age effect in Spanish young footballers (U8 to U19). A comparative analysis in elite clubs vs. low-level clubsEvolución del efecto de la edad relativa en jóvenes jugadores de fútbol (sub-8 a sub-19). Un análisis comparativo entre clubes de élite y clubes de nivel inferior

Práxedes Pizarro, A., Villar Álvarez, F., Gil Arias, A., Pizarro Mateo, D., Moreno Domínguez, A. (2019). Evolution of the relative age effect in Spanish young footballers (U8 to U19). A comparative analysis in elite clubs vs. low-level clubs. European Journal of Human Movement, 43, 102-114. ISSN 0214-0071