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The scaling of human interactions with city size

(2014) M. Schlapfer et al.   Journal of the Royal Society Interface

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A universal model for mobility and migration patterns

(2012) Filippo Simini et al.   NATURE

Migration and "Low-Skilled" Workers in Destination Countries

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Urban Scaling and Its Deviations: Revealing the Structure of Wealth, Innovation and Crime across Cities

(2010) Luís M. A. Bettencourt et al.   PLoS One