Idle-Channel Noise Characteristic of a Delta Modulator with Step Imbalance and Quantizer Hysteresis. - B. Gotz; Y. C. Ching; Gary L. Baldwin (IEEE Trans. Commun., 1975)

Using Triangularly Weighted Interpolation to Get 13-Bit PCM from a Sigma-Delta Modulator. - James C. Candy; Y. C. Ching; D. S. Alexander (IEEE Trans. Commun., 1976)