A comparative study of the use of zero-crossing analysis methods for vowel recognition. - Patrick F. Castelaz; Russell J. Niederjohn (ICASSP, 1976)

Prototype classification and feature selection with fuzzy sets. - James C. Bezdek; Patrick F. Castelaz (IEEE Trans. Syst. Man Cybern., 1977)

A comparison of linear prediction, FFT, and zero-crossing analysis techniques for vowel recognition. - Patrick F. Castelaz; Russell J. Niederjohn (ICASSP, 1978)

Neural networks in defense applications. - Patrick F. Castelaz (ICNN, 1988)

SDI applications of neural network technology. - Patrick F. Castelaz; James E. Zmuda; Dwight E. Mills (Neural Networks, 1988)