1. ISO/IEC 11172-2 Information Technology: Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to 1.5 Mbits/s. Part 2 (1993)
2. ISO/IEC 13818-2 Information Technology: Generic Coding of Moving Pictures and Associated Audio Information. Part 2: Video (2000)
3. ISO/IEC 14496-2 Information Technology: Coding of Audio-Visual Objects. Part 2: Visual (2001)
4. ITU-T Recommendation H.261: Video Codec for Audiovisual Services at px64 kbit/s, Geneve (1990)
5. ITU-T Recommendation H.263: Video Coding for Low Bitrate Communication. Version 2, Geneve (1998)