Uzzo, M., G. Bonaventura, A. Gerbino, G. Spatola, and A. Leone. “Immunohistochemical Expression of Cytokeratins in Periapical Lesions”. Italian Journal of Anatomy and Embryology, vol. 116, no. 2, Nov. 2011, p. 195, https://oajournals.fupress.net/index.php/ijae/article/view/4769.