Dalit  Sela-Donenfeld, Korner, Mira , Pick, Marjorie , Eldor, Amiram , and Panet, Amos . 1996. ?Programmed Endothelial Cell Death Induced By An Avian Hemangioma Retrovirus Is Density Dependent?. Virology, 223, Pp. 233?237. doi:10.1006/viro.1996.0472.