C. García Ortega and R. Zugasti Azagra, “The virtual campaign: Analysis of the Twitter accounts of Rajoy and Rubalcaba in the 2011 Spanish general elections”, Hist. Comun. Soc., vol. 19, pp. 299–311, Apr. 2014, doi: 10.5209/rev_HICS.2014.v19.45029.