Uniqueness of Lower Semicontinuous Viscosity Solutions for the Minimum Time Problem. - Olivier Alvarez; Shigeaki Koike; Isao Nakayama (SIAM J. Control. Optim., 2000)

On Fully Nonlinear PDEs Derived from Variational Problems of Lp Norms. - Toshihiro Ishibashi; Shigeaki Koike (SIAM J. Math. Anal., 2001)

Non-linear Partial Differential Equations, Viscosity Solution Method in. - Shigeaki Koike (Encyclopedia of Complexity and Systems Science, 2009)