1. Cantrell, J. L., Killion, G. M., Kollmorgen, G. M.: Correlations between humoral immunity and successful chemotherapa-immunotherapy. Cancer Res. 36, 3051–3057 (1976)
2. Fidler, I. J., Kripke, M. L.: Metastasis results from preexisting variant cells within a malignant tumor. Science 197, 893–895 (1977)
3. Fridberg, S.: Comparison of an immunoresistant and an immunosusceptible ascites subline from the murine tumor TA3. I. Transplantability, morphology, and some physicochemical characteristics. J. Natl. Cancer Inst. 48, 1463–1476 (1972)
4. Gutterman, J. U.: Cancer systemic active immunotherapy today — Prospects for tomorrow. Cancer Immunol. Immunother. 2, 1–9 (1977)
5. Hersh, E. M., Gutterman, J. U., Mavlight, G.: Immunotherapy of cancer in Man. Springfield, Ill.: Charles C. Thomas 1973