Computer generated graphic segments in a raster display. - Richard A. Metzger (AFIPS Spring Joint Computing Conference, 1969)

Analysis of compressed speech signals in an Automatic Speaker Recognition system. - Richard A. Metzger; John F. Doherty; David M. Jenkins (CISS, 2015)

Using Approximate Entropy as a speech quality measure for a speaker recognition system. - Richard A. Metzger; John F. Doherty; David M. Jenkins (CISS, 2016)

Approximate Entropy and Empirical Mode Decomposition for Improved Speaker Recognition. - Richard A. Metzger; John F. Doherty; David M. Jenkins; Donald L. Hall (Adv. Data Sci. Adapt. Anal., 2020)