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As i say in the post ... The previous research was adapted from a paper called “Crime in neighborhoods: Evidence from Santiago, Chile”, Crime Prevention and Community Safety (CPCS) 16(3), 205–226, 2014. Written by me and Mauricio Olavarria (https://www.researchgate.net/profile/Mauricio_Olavarria-Gambi)... also you can see my researchgate page where that paper was also published.