Gijo John, Tejpal Singh, Ahtesham Aleem, and Niyati Singh Thakur. “Non Surgical Endodontic Treatment of Cutaneous Extraoral Sinus Tract: Report of 2 Cases”. Asian Pacific Journal of Health Sciences, vol. 2, no. 4(s), Dec. 2015, pp. 11-14, doi:10.21276/apjhs.2015.2.2s.2.