CONCEPTShttp://cat.aii.caas.cn/concept/31621cat.aii.caas.cnhttp://dewey.info/class/595.79/dewey.infohttp://linkeddata.ge.imati.cnr.it:2020/resource/EARTh/22960linkeddata.ge.imati.cnr.ithttp://lod.nal.usda.gov/nalt/4960lod.nal.usda.govhttp://www.eionet.europa.eu/gemet/concept/4127www.eionet.europa.eu。