1. Spread by the vascular system;Roberts,1961
2. Technic and results of isolation of cancer cells from the circulating blood;Roberts;Arch. Surg.,1958
3. Simplified technique for separation of cancer cells from blood;Long;J.A.M.A.,1959
4. Method for cytological detection of tumor cells in vitro;Romsdahl;J. Nat. Cancer Inst.,1961
5. McGrath, R., Valaitis, J., McGrew, E. and Roberts, S. Separation of cancer cells from blood by differential filtration. In preparation.