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3. International Telecommunication Union-Telecommunication (ITU-T), Recommendation H.261, Video Codec for Audiovisual Services at px64 kbit/s, Version 1, 1990; Version 2, 1993.
4. ITU-T and ISO/IEC JTC 1, Generic Coding of Moving Pictures and Associated Audio Information—Part 2: Video, ITU-T Rec. H.262 and ISO/IEC 13818-2 (MPEG-2 Video), Version 1, 1994.
5. ITU-T, Video Coding for Low Bitrate Communication, ITU-T Rec. H.263, Version 1, 1995, Version 2, 1998, Version 3, 2000.