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	1.	Unveiling the geography of historical patents in the United States from 1836 to 1975. [electronic resource] by Petralia, Sergio Balland, Pierre-Alexandre Rigby, David L Producer: 20161216 In: Scientific data vol. 3 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Complex economic activities concentrate in large cities. [electronic resource] by Balland, Pierre-Alexandre Jara-Figueroa, Cristian Petralia, Sergio G Steijn, Mathieu P A Rigby, David L Hidalgo, César A Producer: 20200415 In: Nature human behaviour vol. 4 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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