S. P., M. “Mandibular Premolar Root Canal Cleaning Efficacy of Ultrasonic and Hand Debridement-A Scanning Electron Microscope Study”. Journal of Pierre Fauchard Academy (India Section), vol. 26, no. 2, Dec. 2018, pp. 69-75, http://informaticsjournals.com/index.php/jpfa/article/view/22834.