Nanosecond Logic by Amplitude Modulation at X Band. - William C. G. Ortel (IRE Trans. Electron. Comput., 1959)

Experience with speech recognition in automating telephone operator functions. - Dina Yashchin; William C. G. Ortel (EUROSPEECH, 1991)

The VOIS project in retrospect. - William C. G. Ortel; Dina Yashchin (EUROSPEECH, 1993)

Observed long-term changes in customer calling patterns in a telephone application using automatic speech recognition. - William C. G. Ortel (EUROSPEECH, 1995)