Digital Encoding of Phase Shift Keying Voiceband Data Signals. - John Ben O'Neal Jr.; R. Rao Koneru; Jagannath P. Agrawal (IEEE Trans. Commun., 1980)

The Design of an ADPCM/TASI System for PCM Speech Compression. - Jagannath P. Agrawal; John Ben O'Neal Jr.; J. S. Cooper (IEEE Trans. Commun., 1981)

Sample Robbing in Predictive Speech Coders. - Jagannath P. Agrawal; Subramaniam S. Iyer (IEEE Trans. Commun., 1986)