On pole-zero modeling of speech. - Kil Ho Song; Chong Kwan Un (ICASSP, 1980)

Pole-zero modeling of noisy speech and its application to vocoding. - Kil Ho Song; Chong Kwan Un (ICASSP, 1982)

Implementation of a Two-Channel LPC Vocoder. - Byoung Cheol Shin; Hyeong-Ho Lee; Chong Kwan Un; Sang Zee Lee; Kil Ho Song (IEEE Trans. Commun., 1983)