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\bibitem{Nolte_etal2005} Nolte, A. W., Freyhof, J., Stemshorn, K. C., \& Tautz, D. (2005). An invasive lineage of sculpins, Cottus sp. (Pisces, Teleostei) in the Rhine with new habitat adaptions has originated from hybridization between old phylogeographic groups. \textit{Proc. R. Soc. B}, \textit{2005}(272), 2379--2387.

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