See ITU-R HD standards.
"ITU-R 2020." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/itu-r-2020>.
ITU-R 2020. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/itu-r-2020
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