Canapini, Lorenzo, Ciro Hosseini Varde’i, Antonio Cejudo-Palomo, and Riccardo Izzo. 2019. “Analysis of the Physical Efficiency Index in Football Teams and Correlation With Goal Events: A Survey of the Italian Serie A Championship”. Journal of Human Sport and Exercise 14 (5proc):S2390-S2399. https://www.jhse.ua.es/article/view/2019-v14-n5-proc-physical-efficiency-index-football-teams-goal-e.