Superconvergence of the gradient of Galerkin approximations for elliptic problems Mitsuhiro T. Nakao — 1987 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
Error Estimates of a Galerkin Method for Some Nonlinear Sobolev Equations in one Space Dimension. Mitsuhiro T. Nakao — 1985 Numerische Mathematik
Numerical verifications of solutions for elliptic equations in nonconvex polygonal domains. Mitsuhiro T. Nakao; N. Yamamoto — 1993 Numerische Mathematik