Boteva, E., and S. Yantscheva. “Apical Conical Size of the Root Lengths: An Anatomical Comparative Study of Significance to Minimally Invasive Endodontics”. Acta Medica Bulgarica, vol. 53, no. Suppl 1, Feb. 2026, pp. 30-35, https://doi.org/10.2478/AMB-2026-0004.