Media type: E-Article Title: Automatic Concept Extraction Based on Semantic Graphs From Big Data in Smart City Contributor: Qiu, Jing; Chai, Yuhan; Tian, Zhihong; Du, Xiaojiang; Guizani, Mohsen imprint: Institute of Electrical and Electronics Engineers (IEEE), 2020 Published in: IEEE Transactions on Computational Social Systems Language: Not determined DOI: 10.1109/tcss.2019.2946181 ISSN: 2329-924X; 2373-7476 Origination: Footnote: