R. Rajasekhar, S. Soman, V. M. Sebastian, S. Muliyar, and N. M. Cherian, “Indexes for periapical health evaluation: A review”, Int Dent Res, vol. 12, no. 2, pp. 97–106, Aug. 2022, doi: 10.5577/intdentres.2022.vol12.no2.8.