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Costales, Emilio ORCID: https://orcid.org/0000-0003-1595-5531 (2021) Identifying sources of innovation: building a conceptual framework of the Smart City through a social innovation perspective. Cities: The International Journal of Urban Policy and Planning, 120:103459. ISSN 0264-2751 (Print), 1873-6084 (Online) (doi:10.1016/j.cities.2021.103459)