M. R. Nabavizadeh, M. R. Jouyandeh, A. Atbaee, and M. Sedigh Shams, “Nonsurgical Endodontic Treatment of a Maxillary Central Incisor with Two Separate Roots: A Case Report”, Iran Endod J, vol. 5, no. 3, pp. 135–137, Oct. 2010.