Enhancement of ADPCM speech by adaptive postfiltering. - Venkatasubbarao Ramamoorthy; Nuggehally S. Jayant (AT&T Bell Lab. Tech. J., 1984)

Adaptive postfiltering of 16 kb/s-ADPCM speech. - Nikil S. Jayant; Venkatasubbarao Ramamoorthy (ICASSP, 1986)

High quality image coding with a model-testing vector quantizer and a human visual system model. - Venkatasubbarao Ramamoorthy; Nikil S. Jayant (ICASSP, 1988)

Enhancement of ADPCM speech coding with backward-adaptive algorithms for postfiltering and noise feedback. - Venkatasubbarao Ramamoorthy; Nikil S. Jayant; Richard V. Cox; Man Mohan Sondhi (IEEE J. Sel. Areas Commun., 1988)