{"id":"W3171619937","doi":"10.1007/s00500-021-05878-z","title":"RETRACTED ARTICLE: Coopetition analysis in industry upgrade and urban expansion based on fractional derivative gray Lotka–Volterra model","year":2021,"lang":"en","type":"article","venue":"Soft Computing","topic":"Grey System Theory Applications","field":"Decision Sciences","cited_by":14,"is_retracted":true,"has_abstract":false,"ca_institutions":"University of Waterloo","funders":"National Natural Science Foundation of China","keywords":"Gray (unit); Upgrade; Volterra equations; Structural equation modeling; Urban expansion; Fractional calculus; Computer science; Mathematical optimization; Econometrics; Mathematics; Applied mathematics; Engineering; Urban planning; Civil engineering; Nonlinear system; Machine learning; Physics","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null}