Submodule of free Z-module
Futa, Yuichi, Okazaki, Hiroyuki, Shidama, Yasunari
Higher Order Partial Differentiable Functions
Nakasho, Kazuhisa, Shidama, Yasunari
Bidual Spaces and Reflexivity of Real Normed Spaces
Narita, Keiko, Endou, Noboru, Shidama, Yasunari