@article {Lu_2003_SuperconvergentQMR, title = {A Quasi-Minimal Residual Method for Simultaneous Primal-Dual Solutions and Superconvergent Functional Estimates}, journal = {SIAM Journal on Scientific Computing}, volume = {24}, number = {5}, year = {2003}, pages = {1693-1709}, doi = {10.1137/S1064827501390625}, author = {Lu, J and Darmofal, D L} }