Birang, Reza, et al. “Comparison of Er:YAG Laser and Ultrasonic Scaler in the Treatment of Moderate Chronic Periodontitis: A Randomized Clinical Trial”. Journal of Lasers in Medical Sciences, vol. 8, no. 1, Jan. 2017, pp. 51-55, https://journals.sbmu.ac.ir/jlms/article/view/11808.