1. Chambers, A.F., Shafir, R., and Ling, V., Cancer Res. 42: 4018–4025, 1982.
2. Hill, R.P., and Bush, R.S. Int. J. Radiat. Biol. Relat. Stud. Phys. Chem Med. 15: 435–444, 1969.
3. Fidler, I.J., Nature New Biol. 242: 148–149, 1973.
4. Cifone, M.A., and Fidler, I.J. Proc. Natl. Acad. Sci. USA 77: 1039–1043, 1980.
5. Seppa, S.T., Seppa, H.E., Liotta, L.A., Glaser, B.M., and Martin, G.R., Invasion Met. 3: 139–150, 1983.