http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
SHYLOC Workshop (2nd : 2000 : Volos, Greece)
Denmark. Institute of Water and Environment (DHI)
European Commission. DG Joint Research Centre
Ελληνικό Κέντρο Βιοτόπων-Υγροτόπων (ΕΚΒΥ)