Ahmed, M. R., Shahzad, R., & Sandhu, I. N. (2016). Effects of Maintaining Apical Patency on Post-Operative Pain in Molars with Necrotic Pulp and Apical Periodontitis. Annals of Punjab Medical College, 12(1), 59-61. https://doi.org/10.29054/apmc/2018.163