1. Bachmann, B.J.: Pedigrees of some mutant strains of Escherichia coli K-12. Bact. Rev. 36, 525–557 (1972)
2. Campbell, A.: Sensitive mutants of bacteriophage lambda. Virology 14, 22–32 (1961)
3. Davidson, N., Szybalski, W.: Physical and chemical characteristics of lambda DNA. The bacteriophage lambda (Hershey, A.D., ed.), pp. 45–82. New York: Cold Spring Harbor Laboratory 1971
4. Davis, B.D., Mingioli, E.S.: Mutants of Escherichia coli requiring methionine or vitamin B12. J. Bact. 60, 7–28 (1950)
5. Davis, R.W., Simon, M., Davidson, N.: Electron microscope heteroduplex methods for mapping regions of base sequence homology in nucleic acids. Methods in enzymology (Grossman, L., ed.), 21, 413–428. New York and London: Academic Press 1968