1. Economist Intelligence Unit (Ed.), The Green City Index Siemens AG, 2012.
2. Automated quality assessment of metadata across open data portals;Neumaier;ACM Journal of Data and Information Quality (JDIQ),2016
3. Interacting with statistical linked data via OLAP operations;Kämpgen,2012
4. R. Cyganiak, D. Reynolds, J. Tennison, The RDF data cube vocabulary, W3C recommendation, W3C, 2014.
5. T. Lebo, D. McGuinness, S. Sahoo, PROV-O: The PROV ontology, W3C recommendation, W3C, Apr. 2013. URL http://www.w3.org/TR/2013/REC-prov-o-20130430/.