1. Oostdam, B. L. Mar. Pollut. Bull. 11, 138 (1980).
2. Höpner, Th., Berthe-Corti, L., Harder, H. & Michaelsen, M. Erdôl Kohle 44, 197 (1991).
3. Readman, J. W. et al. Nature 358, 662 (1992).
4. Cerniglia, C. E., Gibsen, D. T. & van Baalen, C. J. gen. Microbiol. 116, 485, 495 (1980).
5. Golubic, S. in Environmental Evolution: Effects of the Origin and Evolution of Life on Planet Earth (ed. Margulis. L.) 103–130 (MIT. Cambridge, Massachusetts, 1992).