Optimization of recursive cascade filters. - Kotaro Hirano; Hisashi Sakaguchi; Bede Liu (ICASSP, 1976)

24- and 120-Channel Transmultiplexers Built with New Digital Signal Processing LSI's. - Rikio Maruta; Akira Kanemasa; Hisashi Sakaguchi; Masao Hibino; Kenji Nakayama (IEEE Trans. Commun., 1982)