Benson, S.J., Ruis, B.L., Fadly, A.M., Conklin, K.F., 1998. The Unique Envelope Gene of the Subgroup J Avian Leukosis Virus Derives from ev/J Proviruses, a Novel Family of Avian Endogenous Viruses 72.. https://doi.org/10.1128/jvi.72.12.10157-10164.1998