1. Norris, K.S., in “Evolution and Environment,” Edited by E.T. Drake, Yale University Press, New Haven, Conn., 1968, pp. 297–324.
2. Norris, K.S., in “The Biology of Marine Mammals,” Edited by H.T. Andersen, Academic Press, New York, N.Y., 1969, pp. 391–423.
3. Evans, W.E., J. Acoust. Soc. Amer. 54:191 (1973).
4. Varanasi, U., and D.C. Malins, Biochim. Biophys. Acta 231:415 (1971).
5. Varanasi, U., and D.C. Malins, Science 176:926 (1972).