Pashazadeh, Hasan , Babazadeh, Babak, Nojavan, AliReza. “A comparative study of the role of external instruments in interpreting obligations in sports contracts.” پژوهش های کاربردی در علوم ورزشی و سلامت, vol. 3, no. 4, 2025, pp. 89-98. 10.71865/journal.2025.08191189986