1. Biodiversity occurrence data published by: Danish Biodiversity Information Facility (Accessed through GBIF Data Portal, data.gbif.org, 2010-01-01)
2. Biodiversity occurrence data published by: Danish Mycological Society (Accessed through GBIF Portal, data.gbif.org, 2013-08-16)
3. Biodiversity occurrence data published by: Herbarium of University of Aarhus (Accessed through GBIF Portal, data.gbif.org, 2010-01-01; 2013-08-16)
4. Biodiversity occurrence data published by: Ocean Biogeographic Information System (OBIS) (Accessed through GBIF Portal, data.gbif.org, 2010-01-01)
5. Björneborn L, Ingwersen P (2004) Toward a basic framework for webometrics. J Am Soc Inf Sci Technol 55(14):1216–1227