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"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: insert 201720 into search. Retrieved May 23, 2017.
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"Global Music Report 2018"(PDF). International Federation of the Phonographic Industry. p. 9. Archived(PDF) from the original on 2 December 2020. Retrieved 25 February 2022 – via FIMI.