P. Thaweesit, S. Sutthasing, N. Jaikong, S. Suksutthiphan, U. Arayatrakoollikit, and A. Jainaen, “Accordance of Working Length in C-shaped Canal Permanent Molars Measured by an Electronic Apex Locator at 0.5 bar in a Model”, Khon Kaen Dent J, vol. 21, no. 1, pp. 21–29, Jun. 2018.