<ul><li><a href=https://www.ecb.europa.eu/ecb/legal/1002/1014/html/index-tabs.en.html target=_blank>Guideline of the European Central Bank(Guideline (EU) 2015/510 of the ECB of 19 December 2014 on the implementation of the Eurosystem monetary policy framework  (ECB/2014/60), OJ L 91, 2.4.2015, p. 3.)</a></li><li><a href=https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A12016E%2FPRO%2F04 target=_blank>Protocol No 4 on the statutes of the European system of central banks ESCB) and of the European Central Bank ECB)(Adopted on 30 March 2010, article. 23)</a></li></ul>