16 kbit/s APC/AB Coder Using a Single Chip Digital Signal Processor. - Yasuhiko Tada; Masahiro Taka; Kouichi Honma (ICC, 1986)

APC-AB codec modules operating at 16 and 8 kbit/s. - Kazunori Irie; Yasuhiko Tada; Kouichi Honma (IEEE J. Sel. Areas Commun., 1988)

Design of bandwidth scalable LSF quantization using interframe and intraframe prediction. - Hiroyuki Ehara; Toshiyuki Morii; Masahiro Oshikiri; Koji Yoshida; Kouichi Honma (INTERSPEECH, 2005)