Weighted-Norm First-Order System Least Squares (FOSLS) for Problems with Corner Singularities.

E. Lee Thomas A. Manteuffel C. R. Westphal Weighted-Norm First-Order System Least Squares (FOSLS) for Problems with Corner Singularities. 1974-1996 2006 44 SIAM J. Numerical Analysis 5 http://dx.doi.org/10.1137/050636279 db/journals/siamnum/siamnum44.html#LeeMW06