DOI:
10.1055/s-00000067
Seminars in Hearing
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References
Statista.
Global Apple iPod sales from 2006 to 2014 (in million units).
Available at:
https://www.statista.com/statistics/263405/global-apple-ipod-sales-since-1st-quarter-2006/ . Accessed February 27, 2017
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