Gonçalves, Nuno, Beatriz Pereira, João Meirinhos, Mariana Domingos Pires, Isabel Vasconcelos, Jorge N.R. Martins, and António Ginjeira. “Mandibular First Molar Root Canal Retreatment With the Presence of a Missed Middle Mesial Root Canal: A Report of Two Cases”. Giornale Italiano di Endodonzia 35, no. 1 (February 8, 2021). Accessed August 5, 2021. https://giornaleitalianoendodonzia.it/index.php/gie/article/view/165.