On the Sharpness of Certain Local Estimates for $\overset{\circ}{H}^1$ Projections into Finite Element Spaces: Influence of a Reentrant Corner
Lars B. Wahlbin · Mathematics of Computation · 1984
Lars B. Wahlbin, On the Sharpness of Certain Local Estimates for $\overset{\circ}{H}^1$ Projections into Finite Element Spaces: Influence of a Reentrant Corner, Mathematics of Computation, Vol. 42, No. 165 (Jan., 1984), pp. 1-8