<ul><li><a href=https://www.zakonyprolidi.cz/cs/1990-526 target=_blank>Prices Act(Zákon o cenách, Act No. 526/1990 Coll., last update on 1 July 2017, § 2 - 10a  )</a></li><li><a href=https://www.mfcr.cz/cs/legislativa/cenovy-vestnik target=_blank>Price Bulletin(Website of the Ministry of Finance)</a></li><li><a href=http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02013R0952-20131030 target=_blank>Regulation (EU) No 952/2013 on the Union Customs Code(Regulation (EU) No 952/2013 laying down the Union Customs Code, OJ L 269, p.1, adopted on 10 October 2013, Article 211)</a></li></ul>