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Breeding numbers of Great Cormorants Phalacrocorax carbo in the Western Palearctic, 2012-2013: IUCN-Wetlands International Cormorant Research Group Report (pp. 13-58). Aarhus University, DCE - Danish Centre for Environment and Energy.
http://dce2.au.dk/pub/SR99.pdf
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Status of the breeding population of Great Cormorants in Denmark in 2012. In T. Bregnballe, J. Lynch, R. Parz-Gollner, S. Volponi, J.-Y. Paquet, D. N. Carss & M. R. van Eerden (Eds.),
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http://dce2.au.dk/pub/SR99.pdf