Ger-type and Hyers-Ulam stabilities for the first-order linear differential operators of entire functions. - Takeshi Miura; Go Hirasawa; Sin-Ei Takahasi (Int. J. Math. Math. Sci., 2004)

Stability of multipliers on Banach algebras. - Takeshi Miura; Go Hirasawa; Sin-Ei Takahasi (Int. J. Math. Math. Sci., 2004)

A symmetric operator and its Kaufman's representation. - Go Hirasawa (Period. Math. Hung., 2004)