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4. Commission Implementing Regulation (EU) 2015/909 (2015) on the modalities for the calculation of the cost that is directly incurred as a result of operating the train service of 12 June 2015.
http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32015R0909&from=EN
5. Croatian National Bank (Hrvatska narodna banka).
www.hnb.hr
(accessed on 22 June 2016)