Thetay, A., S. Kumar, M. Irfan, R. Lund, K. Desai, T. Hirani, and J. Sevak. “A Randomized Comparative Study of Platelet-Rich Fibrin Along With Hydroxyapatite Graft for the Treatment of 3-Walled Defects in Chronic Periodontitis”. Medicine and Pharmacy Reports, Sept. 2021, doi:10.15386/mpr-1923.