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Attribution 4.0 International
C. Jara-Figueroa, P.A. Balland, and C. Hidalgo
Balland, P., Jara-Figueroa, C., Petralia, S.G. et al. Complex Economic Activities Concentrate in Large Cities. Nature Human Behavior (2020) doi:10.1038/s41562-019-0803-3