Maloth, K. N., N. Velpula, S. Kodangal, M. Sangmesh, K. Vallamchetla, S. Ugrappa, and N. Meka. “Photodynamic Therapy – A Non-Invasive Treatment Modality for Precancerous Lesions”. Journal of Lasers in Medical Sciences, vol. 7, no. 1, Jan. 2016, pp. 30-36, https://journals.sbmu.ac.ir/jlms/article/view/9324.