<ul><li><a href=https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1998/143/20161231.html target=_blank>Civil Aviation Act(Letecký zákon, Act No. 143/1998  Coll., last update on 1 November 2021, § 27)</a></li><li><a href=https://aim.lps.sk/eAIP/eAIP_SR/AIP_SR_valid/html/LZ-AD-2.LZIB-en-SK.html target=_blank>Aeronautical Information Publication(Aeronautical Information Publication, LZIB AD 2.21, Noise Abatement Procedures)</a></li></ul>