1. Nealson, K., Cohn, D., Leisman, G. & Tebo, B. Ann. NY Acad. Sci. 361, 76–91 (1981).
2. Rosenblatt, R. H. & Johnson, G. D. Proc. biol. Soc. Wash. 104, 328–334 (1991).
3. Bertelsen, E. in Ontogeny and Systematics of Fishes (eds Moser, H. G. et al.) spec. publ. 1, 323–334 (.Am. Soc. Ichthyologists and Herpetologists; Allen, Lawrence, Kansas, (1984).
4. Bertelsen, E. in Fishes of the Northeastern Atlantic and Mediterranean (eds Whitehead, P. J. P., Bauchot, M.-L., Hureau, J.-C., Nielsen, J. & Tortonese, E.) 1371–1414 (UNESCO, Paris, 1986).
5. Leisman, G., Cohn, D. H. & Nealson, K. H. Science 208, 1271–1273 (1980).