Ha, Junhong; Nakagiri, Shin-ichi Approximate controllability of damped second order systems in Hilbert spaces. (English) Zbl 0946.93005 Kobe J. Math. 16, No. 1, 93-108 (1999). Reviewer: S.P.Banks (Sheffield) MSC: 93B05 93C20 93C25 PDFBibTeX XMLCite \textit{J. Ha} and \textit{S.-i. Nakagiri}, Kobe J. Math. 16, No. 1, 93--108 (1999; Zbl 0946.93005)
Park, Jong-Yeoul; Nakagiri, Shin-ichi; Yamamoto, Masahiro Max-min controllability of delay-differential games in Banach spaces. (English) Zbl 0717.90109 Kobe J. Math. 7, No. 2, 147-166 (1990). MSC: 91A23 93B05 PDFBibTeX XMLCite \textit{J.-Y. Park} et al., Kobe J. Math. 7, No. 2, 147--166 (1990; Zbl 0717.90109)
Nakagiri, Shin-ichi; Yamamoto, Masahiro; Lee, Gu Dae Spectral mode controllability, observability and identifiability for isolated spectrum points. (English) Zbl 0701.93010 Kobe J. Math. 6, No. 1, 93-116 (1989). Reviewer: A.Ilchmann MSC: 93B05 93B07 93C25 93B30 93C05 PDFBibTeX XMLCite \textit{S.-i. Nakagiri} et al., Kobe J. Math. 6, No. 1, 93--116 (1989; Zbl 0701.93010)