P. Jiradechochai, C. Pawaputanon Na Mahasarakham, K. Thariya, K. Wangkuenklang, P. Chantarayotha, and S. Jaroonsakchai, “A Comparative Study of Factors Affecting Cyclic Fatigue Resistance Between Tapering and Metallurgic Improvement of NiTi Rotary Files”, Khon Kaen Dent J, vol. 20, no. 2, pp. 63–72, Dec. 2017.