Differential PCM for Speech and Data Signals. - John Ben O'Neal Jr.; Raymond W. Stroh (IEEE Trans. Commun., 1972)

A Comparison of Optimum and Logarithmic Quantization for Speech PCM and DPCM Systems. - Raymond W. Stroh; Mario D. Paez (IEEE Trans. Commun., 1973)

An Experimental Microprocessor-Implemented 4800 Bit/s Limited Distance Voice Band PSK Modem. - Raymond W. Stroh (IEEE Trans. Commun., 1978)