Opinion evolution in the presence of constant propaganda: homogeneous and localized casesMaría Cecilia Gimenez, Luis Reinaudi, Ana Pamela Paz-García, Paulo Marcelo Centres and Antonio José Ramirez-PastorEur. Phys. J. B, 94 1 (2021) 35DOI: https://doi.org/10.1140/epjb/s10051-021-00047-5