Evidence of infectious diseases in harbour porpoises ( Phocoena phocoena ) hunted in the waters off Greenland and by-caught in the German North Sea and Baltic Sea - Wunchmann, A.; Siebert, U.; Frese, K.; Weiss, R.; Lockyer, C.; Heide-Jørgensen, M.P.; Müller, G.; Baumgärtner, W. (2001)