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Bibliometrics is a powerful tool for analyzing knowledge domains and revealing their cognitive-epistemological structure. Different mathematical models and statistical techniques have been proposed and tested to carry out bibliometric analyses and demonstrate their effectiveness in uncovering how fields of research are intellectually structured. These include two hybrid techniques that allow clusters of related documents obtained from a co-citation analysis to be labeled using textual data. This paper reports on the findings of a bibliometric study in which these hybrid techniques are combined to: (1) build and visualize the network of publications shaping the intellectual structure of the smart city research field by considering the first two decades of literature dealing with this subject; (2) map the clusters of thematically-related publications; and (3) reveal the emerging development paths of smart cities that each …