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Query: keyword: "species concept"

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 Article: Species boundaries in non-tropical Northern Hemisphere Owls
K.H. Voous, in: Bijdragen tot de Dierkunde, Vol. 60 (1990), p. 163-170
 Article: The enigmatic Marmorkrebs (marbled crayfish) is the parthenogenetic form of Procambarus fallax (Hagen, 1870)
P. Martin, N.J. Dorn, T. Kawai, C. van der Heiden, G. Scholtz, in: Contributions to Zoology, Vol. 79 (2010), p. 107-118