Hiroshi Kanai, Noriyoshi Chubachi, Ken'iti Kido, Yoshiro Koiwa, Takehiko Takagi, Junichi Kikuchi, Tamotsu Takishima. A new approach to time dependent AR modeling of signals and its application to analysis of the fourth heart sound. IEEE Transactions on Signal Processing, 40(5):1198-1205, 1992. [doi]
Abstract is missing.