A Quasi-Minimal Residual Method for Simultaneous Primal-Dual Solutions and Superconvergent Functional Estimates

Lu, J., and Darmofal, D. L., “A Quasi-Minimal Residual Method for Simultaneous Primal-Dual Solutions and Superconvergent Functional Estimates”, SIAM Journal on Scientific Computing, vol. 24, no. 5, 2003, pp. 1693-1709.