General introduction
Vahl, W.K. (2006). General introduction, in: Vahl, W.K. Interference competition among foraging waders. pp. 11-39
In: Vahl, W.K. (2006). Interference competition among foraging waders. PhD Thesis. Rijksuniversiteit Groningen: The Netherlands. ISBN 90-367-2796-0. 239 pp., more
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