https://www.brookings.edu/articles/are-convention-delegates-bound-to-their-presidential-candidate/
https://ukandeu.ac.uk/non-divergence-is-the-new-consensus-in-british-politics/
https://theconversation.com/peru-empieza-a-caer-en-picado-y-cada-vez-se-complica-mas-su-regeneracion-politica-213408
http://ftp.zew.de/pub/zew-docs/dp/dp20002.pdf