CONCEPTShttp://d-nb.info/gnd/4034922-6d-nb.infohttp://eurovoc.europa.eu/2870eurovoc.europa.euhttp://linkeddata.ge.imati.cnr.it:2020/resource/EARTh/114100linkeddata.ge.imati.cnr.ithttp://lod.gesis.org/thesoz/concept/10050696lod.gesis.orghttp://lod.nal.usda.gov/nalt/60708lod.nal.usda.govhttp://stitch.cs.vu.nl/vocabularies/rameau/ark:/12148/cb119486159stitch.cs.vu.nlhttp://www.eionet.europa.eu/gemet/concept/6861www.eionet.europa.euhttp://zbw.eu/stw/descriptor/16638-6zbw.eu。