1. Adman, R. A., and Pious, D. A., 1970, Isoantigenic variants: isolation from human diploid cells in culture, Science 168:370.
2. Albrecht, A. M., Biedler, J. L., and Hutchison, D. J., 1972, Two different species of dihydrofolate reductase in mammalian cells differentially resistant to amethopterin and methosquin, Cancer Res. 32:1539.
3. Arlett, C. F., Turnbull, D., Harcourt, S. A., Lehmann, A. R., and Colella, C. M., 1975, A comparison of the 8-azaguanine and ouabain-resistance systems for the selection of induced mutant Chinese hamster cells, Mutation Res. 33:261.
4. Atherly, A. G., Barnhart, B. J., and Kraemer, P. M., 1977, Growth and biochemical characteristics of a detachment variant of CHO cells, J. Cell Physiol. 90:375.
5. Baker, R. M., 1976, Genetic and cellular properties of ouabain-resistant mutants, in: Biogenesis and Turnover of Membrane Macromolecules (J. S. Cook, ed.), pp. 93–103, Raven Press, New York.