Xing, Z., R. Sahi, Z. Yu-Yang, W. Jun, and C.-H. Li. “Expressions of HPV 16-E6 in Esophageal Carcinoma and it’s Clinical Significance”. Journal of Pathology of Nepal, vol. 5, no. 9, Mar. 2015, pp. 752-5, doi:10.3126/jpn.v5i9.13786.