Cormorants: ecology and management at the start of the 21st century : proceedings of the 5th International conference on cormorants in Freisi ng, Germany, 17-21 December 2000
edited by Thomas M. Keller and David N. Carss on behalf of the Wetlands International Cormorant Research G roup in cooperation with Andreas J. Helbig and Martin Flade
Bok Engelsk 2003