1. Aronson, S. A., Todaro, G., and Skolnick, E. D., 1971, Induction of murine C-type viruses from clones of virus-free Balb/3T3 cells, Science 174: 157.
2. Astaldi, G., Burgio, G. R., Kre, J., Genova, R., and Astaldi, A. A., Jr., 1969, L-Asparaginase and blastogenesis, Lancet 1: 423.
3. Axelrad, A. A., and Steeves, R. A., 1964, Assay for Friend leukemia virus: Rapid quantitative method based on enumeration of macroscopic spleen foci in mice, Virology 24: 513.
4. Baltimore, D., 1970, RNA-dependent DNA polymerase virions of RNA tumor viruses, Nature (Lond.) 226: 120.
5. Bennett, M., and Eckner, R. J., 1973, Immunobiology of Friend virus leukemia, in: Virus Tumorigenesis and Immunogenesis (W. S. Ceglowski and H. Friedman, eds.), pp. 387–414, Academic Press, New York.