Akram  Alian, Sela-Donenfeld, Dalit , Panet, Amos , and Eldor, Panet . 2000. ?Avian Hemangioma Retrovirus Induces Cell Proliferation Via The Envelope (Env) Gene?. Virology, 276, Pp. 161?168. doi:10.1006/viro.2000.0550.