Pérez Martínez, J.E. 2017. Why did free radios invaded our dial? Reflections on the communicational anomy concept as the origin of alternative communication projects (1976-1989). Estudios sobre el Mensaje Periodístico. 23, 1 (Jul. 2017), 519–534. DOI:https://doi.org/10.5209/ESMP.55611.