Mohammadzade Akhlaghi, N., N. Roghanizad, Z. Khalilak, and N. Rezaie. “Comparison of First Accessory Cone Penetration After Using Stainless-Steel and Ni-Ti Spreaders in Curved Resin Blocks”. Iranian Endodontic Journal, vol. 3, no. 1, Oct. 2008, pp. 131-4, doi:10.22037/iej.v2i4.290.