Nolte, A. W., Freyhof, J., & Tautz, D. (2006). When invaders meet locally adapted types: rapid moulding of hybrid zones between sculpins (Cottus, Pisces) in the Rhine system. Molecular Ecology, 15(7), 1983-1993. doi:10.1111/j.1365-294X.2006.02906.x.