Gallegos-González, G., Erazo-Álvarez, J., Narváez-Zurita, C. and Erazo-Álvarez, C. 2021. Guerrilla marketing in voluntary and independent IESS affiliation processes around COVID-19. CIENCIAMATRIA. 7, 12 (Jan. 2021), 752-781. DOI:https://doi.org/10.35381/cm.v7i12.448.