https://www.naiz.eus/fr/hemeroteca/gara/editions/2017-12-22/hemeroteca_articles/i-e-upn-psn-y-pp-impiden-por-ley-la-lista-unica-con-implicaciones-preocupantes?slug=i-e-upn-psn-y-pp-impiden-por-ley-la-lista-unica-con-implicaciones-preocupantes