1. Properties of malignant cells;Buick,1987
2. Introduction: Cancer as a cellular disease;Hill,1987
3. Human tumor cell heterogeneity and metastasis;Spremulli;J Clin Oncol,1983
4. Tumor heterogeneity;Heppner;Cancer Res,1984
5. Biologic diversity in metastatic neoplasms: Origins and implications;Fidler;Science,1982