Cepstral analysis, regression and the such in speech recognition

On continuing on the magical roller coaster ride that is the discovery of the calculation of delta coefficients, I've come up with these papers which add more insight. These are referenced (not clearly though!) in the Manson paper, I previously mentioned:

• Furui, S. 1981 - Cepstral analysis technique for automatic speaker verification
• Applebaum,T.H., Hanson,B.A. 1991 - Regression features for recognition of speech in quiet and in noise
• Soong, F.K, and Rosenberg, A.E. 1988 - On the use of instantaneous and transitional spectral information in speaker recognition

My explorers hard hat is on. Flash light in hand. Compass at the ready. Into the dark caverns of calculus I immerse...