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↑ Hoehler, Dieter (2008-06-03). "A Brief Review on HDTV in Europe in the early 90's" . LIVE-PRODUCTION.TV .
↑ "RECOMMENDATION ITU-R BT.1197-1 Enhanced wide-screen PAL TV transmission system (the PALplus system)" (PDF) . itu.int .
↑ Searching for the Perfect Aspect Ratio (PDF)
↑ "Understanding Aspect Ratios" (PDF) . CinemaSource . The CinemaSource Press. 2001. Archived from the original (Technical bulletin) on 9 September 2009 . Retrieved 2009-10-24 .

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"NEC Monitor Technology Guide" . NEC. Archived from the original on 2006-05-21 . Retrieved 2006-07-24 .

[1] Hoehler, Dieter (2008-06-03). "A Brief Review on HDTV in Europe in the early 90's" . LIVE-PRODUCTION.TV .

[auto-2] "RECOMMENDATION ITU-R BT.1197-1 Enhanced wide-screen PAL TV transmission system (the PALplus system)" (PDF) . itu.int .

[3] Searching for the Perfect Aspect Ratio (PDF)

[Cinemasource-4] "Understanding Aspect Ratios" (PDF) . CinemaSource . The CinemaSource Press. 2001. Archived from the original (Technical bulletin) on 9 September 2009 . Retrieved 2009-10-24 .

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