1. Adhya, S., and Campbell, A., 1970, Crypticogenicity of bacteriophage λ, J. Mol. Biol. 50, 481.
2. Adhya, S., Gottesman, M., and de Crombrugghe, B., 1974, Release of polarity in Escherichia coli by gene N of phage λ: termination and antitermination of transcription, Proc. Nat. Acad. Sci. USA 71, 2534.
3. Appleyard, R. K., 1956, The transfer of defective λ lysogeny between strains of Escherichia coli, J. Gen. Microbiol. 14, 573.
4. Arai, T., and Clowes, R., 1975, Replication of stringent and relaxed plasmids, in “Microbiology-1974” (D. Schlessinger, ed.), pp. 141–155, Amer. Soc. Microbiol., Washington, D.C.
5. Baltimore, D., Cole, D. N., Villa-Komaroff, L., and Spector, D., 1974, Poliovirus defective interfering particles, in “Mechanisms of Virus Disease” (W. S. Robinson and C. F. Fox, eds.), pp. 117–130, Benjamin, Menlo Park, California.