TY - JOUR AU - Hoseini Ravesh, Seyed Mohammad Hosein AU - Moghaddam, Amir TI - An Estimation of Customer Lifetime Value Based on Quality of Services in Mashhad Body Building Gyms JO - پژوهش های کاربردی در علوم ورزشی و سلامت VL - 2 IS - 2 SP - 19 EP - 36 PY - 2023 DO - 10.71865/jsports.2023.2307-1053 ER -