<ul><li><a href=https://www.boe.es/buscar/act.php?id=BOE-A-2010-20139# target=_blank>Law on universal postal services, the rights of users and the postal market(Ley 43/2010 del servicio postal universal, de los derechos de los usuarios y del mercado postal, adopted on 30 December 2010, last amended on 28 December 2012, Article 34)</a></li><li><a href=https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1590747427251&uri=CELEX:32018R0644 target=_blank>Regulation (EU) 2018/644 of 18 April 2018 on cross-border parcel delivery services(Regulation (EU) 2018/644 of the European Parliament and of the Council of 18 April 2018 on cross-border parcel delivery services. Article 6. )</a></li></ul>