Mueller, J. C., Partsch, E., Link, A., & Seitz, A. (1999). Differentiation of two
cryptic Gammarus fossarum types in a contact area: Morphology, habitat preference, and genetics. In F. R. Schram, & J.
C. von Vaupel Klein (Eds.), Crustaceans and the biodiversity
crisis (pp. 279-286). Leiden: Brill.