The invariant imbedding numerical method for Fredholm integral equations with displacement kernels. - John Casti; Hajime Kagiwada; Robert Kalaba (ACM National Conference, 1969)

MSE-based regularization approach to rank determination in CLS and TLS estimation. - Hajime Kagiwada; Yasushi Aoki; Jingmin Xin; Akira Sano (EUSIPCO, 1996)