Rosato, M. L., M. Mainini, M. Luongo, L. Mascolo, S. Mattera, and L. Schiaffino. “Oxygen-Ozone Therapy: Our Experience in the Treatment of Hard-Root Conflicts”. Ozone Therapy, vol. 1, no. 2, Sept. 2016, pp. 34-35, doi:10.4081/ozone.2016.6271.