3d FEM analysis of vocal tract model of elliptic tube with inhomogeneous-wall impedance. - Hiroki Matsuzaki; Nobuhiro Miki; Nobuo Nagai; Tohru Hirohku; Yoshihiko Ogawa (ICSLP, 1994)

A Realization Method of an ARMAX Lattice Filter. - Miki Haseyama; Tohru Hirohku; Hideo Kitajima (ISCAS, 1995)