Error probability bounds for systematic convolutional codes. - Edward A. Bucher; Jerrold A. Heller (IEEE Trans. Inf. Theory, 1970)

A Microprocessor-Based PSK Modem for Packet Transmission Over Satellite Channels. - Chris Heegard; Jerrold A. Heller; Andrew J. Viterbi (IEEE Trans. Commun., 1978)