Zara, S., M. Di Giulio, S. D’Ercole, L. Cellini, M. Rapino, and A. Cataldi. “Effects of HEMA on Human Gingival fibroblasts/Clinical Streptococcus Mitis Strains Co-Cultured in Vitro”. Italian Journal of Anatomy and Embryology, vol. 115, no. 1/2, Nov. 2010, p. 180, https://oajournals.fupress.net/index.php/ijae/article/view/4565.