S. Hiran-us, J. Sawasdichai, S. Pimkhaokham, A. Ebihara, and H. Suda, “Canal Aberrations Promoted by Three Nickel-Titanium Rotary Instruments in Simulated S-Shaped Canal”, SWU Dent J., vol. 7, no. Suppl, pp. 12–17, Sep. 2014.