http://www.vocabularyserver.com/gemet/el/ GEMET Thesaurus EIONET EIONET 0000-00-00 el 2011-04-14 11:45:12 μέτρηση της ρύπανσης 2011-04-14 11:45:12http://www.vocabularyserver.com/gemet/el/xml.php?skosTema=5119http://www.vocabularyserver.com/gemet/el/xml.php?skosTema=10040