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The pre-history of urban scaling.
Ortman SG, Cabaniss AH, Sturm JO, Bettencourt LM. Ortman SG, et al. Among authors: sturm jo. PLoS One. 2014 Feb 12;9(2):e87902. doi: 10.1371/journal.pone.0087902. eCollection 2014. PLoS One. 2014. PMID: 24533062 Free PMC article.
Settlement scaling and increasing returns in an ancient society.
Ortman SG, Cabaniss AH, Sturm JO, Bettencourt LM. Ortman SG, et al. Among authors: sturm jo. Sci Adv. 2015 Feb 20;1(1):e1400066. doi: 10.1126/sciadv.1400066. eCollection 2015 Feb. Sci Adv. 2015. PMID: 26601129 Free PMC article.