1. Cairns, J., Stent, G. S. and Watson, J. D. (eds.) (1966) Phage and the Origin of Molecular Biology. Cold Spring Harbor Laboratory, Cold Spring Harbour.
2. Campbell, A. (1962) Episomes. Adv. Genet. 11, 101–146.
3. Daniels, D.L., Schoeder, J. L., Scybalski, W., Sanger, F. and Blattner, F. R. (1983) A molecular map of coliphage lambda, in Lambda II (eds. R. W. Hendrix, J. W. Roberts, F. W. Stahl and R. A. Weisberg), Cold Spring Harbor Laboratory, Cold Spring Harbor, 469–517.
4. Davies, R. W., Schreier, P. H. and Buchel, D. E. (1978) Determination of end points of partial deletion. Nucl. Acid Res. 5, 3209–3218.
5. Doerman, A. H. (1952) The intracellular growth of bacteriophages. I. Liberation of intracellular phage T4 by premature lysis with another phage or with cyanide. J. gen. Physiol 35, 645–656.