1. Telcomm. Industry Association (TIA), Washington: DC, Dual-mode subscriber equipment - Network equipment compatibility specification. Interim Standard IS-54, 1989.
2. Telcomm. Industry Association (TIA), Washington: DC, Mobile station - Base station compatibility standard for dual-mode wideband spread spectrum cellular system. EIA/TIA Interim Standard IS-95, 1993.
3. Research and Development Centre for Radio Systems, Japan: Public Digital Cellular (PDC) Standard, RCR STD-27.
4. International Standards Organization: ISO/IEC 11172 MPEG 1 International Standard, Coding of moving pictures and associated audio for digital storage media up to about 1.5 Mbit/s, Parts 1-3.