TINBERGEN JM (1993) Boekbespreking: Ens, B.J., The social prisoner, causes of natural variation in reproductivesuccess of the Oystercatcher, 1992. LIMOSA 66 (4): 172-173.

ENS B. J. 1992. The social prisoner, causes of natural variation in reproductive success of the Oystercatcher. Proefschrift Rijksuniversiteit Groning~ n. 222 p.

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