1. Da Silva, E.J., Kalakoutskii, L.V. & DaKang, S. 1990 Microbial germplasm resources. Impact of Science and Society 40, 133?143.
2. Hill, L.R. & Kirsop, B. (eds) 1991 Living Resources for Biotechnology: Bacteria. Cambridge: Cambridge University Press (other volumes from this series on Yeast, Filamentous Fungi and Animal Cells have also been published).
3. Rayssinguier, C., Thaler, D. & Radman, M. 1989 The barrier to recombination between Escherichia coli and Salmonella tryphimurium is disrupted in mismatch-repair mutants. Nature, 342, 396?401.
4. Smith, J.M., Dowson, C.G. & Spratt, B.G. 1991 Localized sex in bacteria. Nature, 349, 29?31.
5. Vassarotti, A. & Magnien, E. (eds) 1990 Biotechnology R&D in the EC. Paris: Elsevier.