1. Amundin M, Cranford T (1990) Forehead anatomy of Phocoena phocoena and Cephalorhynchus commersonii: 3-dimensional computer reconstructions with emphasis on the nasal diverticula. In: Thomas JA, Kastelein RA (eds), Sensory Abilities of Cetaceans: Laboratory and Field Evidence. New York: Plenum Press, pp. 1–18.
2. Au WWL (1990) Target detection in noise by echolocat-ing dolphins. In: Thomas JA, Kastelein RA (eds) Sensory Abilities of Cetaceans: Laboratory and Field Evidence. New York: Plenum Press, pp. 203–216.
3. Au WWL, Floyd RW, Penner RH, Murchison AE (1974) Measurement of echolocation signals of the Atlantic bottle-nosed dolphin Tursiops truncatus Montagu in open waters. J Acoust Soc Am 56:1280–1290.
4. Awbrey FT (1990) Concluding comments on cetacean hearing and echolocation. In: Thomas JA, Kastelein RA (eds) Sensory Abilities of Cetaceans: Laboratory and Field Evidence. New York: Plenum Press, pp. 427–433.
5. Barnes LG and Mitchell E (1978) Cetacea. In: Maglio VJ, Cooke HBS (eds) Evolution of African Mammals. Cambridge: Harvard Univ Press, pp. 582–602.