1. Fidler IJ, Poste G: The heterogeneity of metastatic properties in malignant tumor cells and regulation of the metastatic phenotype. In: Owen A, Coffey DS, Baylin SB (eds) Tumor cell heterogeneity. New York, Academic Press, New York, 1982, pp 127?142.
2. Fidler IJ, Hart IR: Biological diversity in metastasis and metastatic neoplasms: Origins and implications. Science 217: 998?1003, 1982.
3. Heppner G: Tumor heterogeneity. Cancer Res 214:2259?2265, 1984.
4. Fidler IJ, Poste G: The cellular heterogeneity of malignant neoplasms: Implications for adjuvant chemotherapy. Semin Oncol 12:207?222, 1985.
5. Dexter DL, Leith JT: Tumor heterogeneity and drug resistance. J Clin Oncol 4:244?257, 1986.