B., N., N. B., K. S. R., and T. H. I. “Endodontic Retreatment - Unusual Anatomy of A Maxillary Second and Mandibular First Premolar: Report of Two Cases”. Journal of Pierre Fauchard Academy (India Section), vol. 25, no. 4, Dec. 2018, pp. 209-11, https://informaticsjournals.com/index.php/jpfa/article/view/23050.