The attention as a key element to improve tactical behavior efficiency of young soccer players - Andrade, Marcelo Odilon Cabral de (Universidade Federal de Viçosa. Centre of Research and Studies in Soccer (NUPEF)) ; González-Víllora, Sixto (Universidad de Castilla-La Mancha. Departamento de Didáctica de la Educación Física, Artística y Música) ; Casanova, Filipe (University of Porto. Faculty of Sport (FADEUP)) ; Teoldo, Israel (Universidade Federal de Viçosa)