Jelodar, S. M., Jelodar, S. B., Malmir, M., & Ziapour, A. (2016). Factors Affecting the Excitement and Violence in Football: A survey on Spectators and Fans of Esteghal and Persepolis. Social Sciences, 11(10), 2541-2546. https://doi.org/10.3923/sscience.2016.2541.2546