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2. BioCASE (2006). Biological Collection Access Services (BioCASE), http://www.biocase.org.
3. Darwin Core (2006). Darwin Core, http://darwincore.calacademy.org/.
4. ENBI (2005). European Network for Biodiversity Information (IST 2001-00618). http://www.enbi.info.
5. GBIF (2006). Global Biodiversity Information Facility (GBIF), http://www.gbif.org.