1. Gey, G. O. Cytological and cultural observations on transplantable rat sarcomata produced by inoculation of altered normal cells maintained in continuous culture. Cancer Res. 1: 737; 1941.
2. Earle, W. R.; Nettleship, A. Production of malignancy in vitro. V. Results of injections of cultures into mice. J. Natl. Cancer Inst. 4: 213–227; 1943.
3. Sanford, K. Malignant transformation of cells in vitro. Int. Rev. Cytol. 18: 249–311; 1965.
4. Ponten, J. Spontaneous and virus-induced transformation in culture. In: Gard, S.; Hallauer, C.; Meyer, K. F. eds. Virology monographs. Wien, New York: Springer-Verlag; 1971: 1–45.
5. Pollack, R.; Wolman, S.; Vogel, A. Reversion of virus-transformed cell lines: hyperploidy accompanies retention of viral genes. Nature 228: 967–970; 1970.