1. Higuchi, K.: Adv. Appl. Microbiol. 16, 111 (1973)
2. Katsuta, H., Takaoka, T.: Methods Cell Biol. 6, 1 (1973)
3. Ham, R. G. in: Growth of Cells in Hormonally Defined Media (Sato, G., Pardee, A., Sirbasku, D. eds.) p. 39, Cold Spring Harbor Laboratory 1982
4. Sato, G.: Nature 259, 132 (1976)
5. Moore, G. in: Methods in Cancer Res. (Busch, H. ed.) 5, 423 (1970)