Sartaj, M., Bhat, M.M., Majid, S., Farooq, R., Rashid, A. and Ahmad, F. 2019. COMPARATIVE EFFICACY OF THREE DIFFERENT RETREATMENT FILE SYSTEMS IN REMOVING GUTTA PERCHA DURING ENDODONTIC RETREATMENT: AN IN VITRO STEREOMICROSCOPIC STUDY. International Journal of Pharmaceutical and Biological Science Archive. 7, 1 (Feb. 2019).