1. Armstrong MYK, Ebenstein P, Königsberg WH, Richards FF (1978) Endogenous RNA tumor viruses are activated during chemical induction of murine plasmacytomas. Proc Natl Acad Sci (USA) 75: 4549?4552
2. Ball JK, McCarter JA (1971) Repeated demonstration of a mouse leukemia virus after treatment with chemical carcinogens. J Natl Cancer Inst 46: 751?762
3. Ehm I, Drescher B, Fey F (1982) Characterization of murine leukemia virus activated during N-nitroso-N-methylurea-induced leukemogenesis in mice. I. Host range of the activated viruses. Neoplasma 29: 169?173
4. Ehm I, Drescher B, Fey F, Paliege R, Altaner L (1982) Characterization of the murine leukemia virus activated during N-nitroso-N-methylurea-induced leukemogenesis in mice. II. Dualtropism of the activated virus. Arch Geschwulstforsch 52: 621?623
5. Erfle V, Hehlmann R, Schetters H, Meier A, Luz A (1980) Time course of C-type retrovirus expression in mice submitted to osteosarcomagenic doses of 224radium. Int J Cancer 26: 107?113