
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6430&CESifoWP.search=+

https://theconversation.com/frances-second-ballot-system-may-seem-chaotic-but-heres-how-it-benefits-voters-236188

https://theconversation.com/el-franquismo-en-la-gran-pantalla-historia-del-no-do-221799