https://theconversation.com/la-muerte-de-navalni-confirma-el-fin-de-cualquier-esperanza-para-la-oposicion-en-rusia-223799
http://www.inegalites.fr/spip.php?page=analyse&id_article=2289&id_rubrique=64&id_mot=30&id_groupe=9
https://www.socialeurope.eu/2017/06/understanding-digital-revolution-means/