40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM). International Telecommunication Union ITU-T Recommendation G.726, December, 1990.
bibtex   
@misc{ g726,
  author = {{International Telecommunication Union}},
  title = {40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)},
  howpublished = {ITU-T Recommendation G.726},
  month = {December},
  year = {1990}
}
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