Subjective evaluation of SPAC in improving the quality of noisy speech. - Mamoru Nakatsui (ICASSP, 1979)

Subjective Evaluation of a 4.8 kbit/s Residual-Excited Linear Prediction Coder. - Mamoru Nakatsui; Dale C. Stevenson; Paul Mermelstein (IEEE Trans. Commun., 1981)

Dual adaptive delta modulation for mobile voice channel and its DSP implementation. - Mamoru Nakatsui; Kazuo Nakata (ICASSP, 1985)