Evolution of the political opinion landscape during electoral periodsTomás Mussi Reyero, Mariano G. Beiró, J. Ignacio Alvarez-Hamelin, Laura Hernández and Dimitris KotzinosEPJ Data Sci., 10 1 (2021) 31DOI: https://doi.org/10.1140/epjds/s13688-021-00285-8