Asymptotically exact a posteriori estimators for the pointwise gradient error on each element in irregular meshes. Part 1: A smooth problem and globally quasi-uniform meshes.

Wolfgang Hoffmann Alfred H. Schatz Lars B. Wahlbin Gabriel Wittum Asymptotically exact a posteriori estimators for the pointwise gradient error on each element in irregular meshes. Part 1: A smooth problem and globally quasi-uniform meshes. 897-909 2001 70 Math. Comput. 235 db/journals/moc/moc70.html#HoffmannSWW01