1. Monin, A. S., Kamenkovich, V. M. & Kort, V. G. Variability of the Oceans (Wiley, New York, 1977).
2. Jenkins, G. M. & Watts, D. G. Spectral Analysis and its Applications (Wiley, New York, 1968).
3. Steele, J. H. Nature 313, 355–358 (1985).
4. Steele, J. H. J. theor. Biol. 153, 425–436 (1991).
5. Steele, J. H. & Henderson, E. W. Science 224, 985–987 (1984).