The Papillomavirus Episteme: a central resource for papillomavirus sequence data and analysis. - Koenraad Van Doorslaer; Qina Tan; Sandhya Xirasagar; Sandya Bandaru; Vivek Gopalan; Yasmin Mohamoud; Yentram Huyen; Alison A. McBride (Nucleic Acids Res., 2013)