Alavi, S. M. , , Karimi, M. R. , and Ebrahimi, A. . "Investigating Customer’s Zone of Tolerance by Analyzing the Desired, Acceptable and Perceived Service of Sports Marketing Mix: The Case of Kosar Sports Complex", Research in sport Management, 8, 8, 2019, 101-130. doi: 10.22054/qrsm.2019.11016