Description of the Collective Behavior in Competition of Young Soccer Players Under-16 (U-16), Under-17 (U-17), Under-19 (U-19), and Under-23 (U-23), Considering the Areas of the Pitch and Phases of the Game

1. Nieto, S.
2. Echeazarra, I.
3. Errekagorri, I.
4. Castellano, J.