?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=F&rft.au=Umar%2C+F&rft.aulast=Umar&rft.volume=37&rft.atitle=Assessing+the+Spatial+Concentration+of+Urban+Crime%3A+An+Insight+from+Nigeria&rft.date=6+January+2020&rft.pages=605-624&rft.issn=0748-4518&rft.title=Journal+of+Quantitative+Criminology&rft.genre=article