1. Starlinger, P. & Saedler, H. Curr. Topics Microbiol. Immun. 75, 111–152 (1976).
2. Nevers, P. & Saedler, H. Nature 268, 109–115 (1977).
3. Campbell, A. et al. in DNA Insertion Elements, Plasmids, and Episomes (eds Bukhari, A. I. Shapiro, J. A. & Adhya, S.) 15–22 (Cold Spring Harbor Laboratory, New York, 1977).
4. Fiandt, M., Szybalski, W. & Malamy, M. H. Molec. gen. Genet. 119, 223–231 (1972).
5. Hirsch, H.-J., Starlinger, P. & Brachet, P. Molec. gen. Genet. 119, 191–206 (1972).