On tree coding with a fidelity criterion. - Charles R. Davis; Martin E. Hellman (IEEE Trans. Inf. Theory, 1975)

Improvements in the classical model for better speech quality. - Sidhartha Maitra; Charles R. Davis (ICASSP, 1980)

A maximum peakiness criterion for deconvolving speech waveforms. - Sidhartha Maitra; Scott H. Foster; Charles R. Davis (ICASSP, 1980)