https://www.socialeurope.eu/eu-enlargement-prospects-and-challenges
https://ec.europa.eu/commission/presscorner/api/files/document/print/ov/speech_22_5493/SPEECH_22_5493_OV.pdf
https://theconversation.com/renuncia-o-reafirmacion-pedro-sanchez-detiene-su-agenda-mientras-espana-esta-en-vilo-228721