- Verboom, Kastelein 1995a
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- Verboom, Kastelein 1995b
- The rutting whistles of a male Pacific walrus (Odobenus rosmaruas divergens), In: Sensory systems of Aquatic Mammals (eds. R. A. Kastelein, J. A. Thomas and P. E. Nachtigall), De Spil Publishers, Woerden Holland.