Literature
  • Verboom, Kastelein 1995a
  • Acoustic signals by Harbour porpoises, In: Harbour porpoises, laboratory studies to reduce bycatches (eds. P. E. Nachtigall, J. Lien, W. W. L. Au and A. J. Read), De Spil Publishers, Woerden Holland.
  • 1985
  • Airborne acoustic communication in the Walrus Odobenus rosmarus, NGR, Winter, p 124-145.
  • Northridge 1991
  • An updated world review of interactions between marine mammals and fisheries. FAO Fisheries Technical Paper 251 (Supple. 1): 58 pp.
  • Schevill 1966
  • Analysis of underwater Odobenus calls with remarks on the development of pharyngeal pouches, Zoologica (N.Y.), 51(3), p 103-106.