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"ČNS IFPI" (in Czech). Hitparáda – Radio Top 100 Oficiální. IFPI Czech Republic. Note: Select 20. týden 2015 in the date selector. Retrieved 22 November 2016.
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hitparadask.ifpicr.cz
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"Årslista Singlar - År 2015" (in Swedish). Sverigetopplistan. Swedish Recording Industry Association. Archived from the original on 25 January 2016. Retrieved 9 January 2016.