biconjugate gradient stabilized method quasi-minimal residual variant of biconjugate gradient stabilized method 2011-07-19 http://identifiers.org/doi/10.1137/0915023 AZ QMRCGSTAB QMRCGSTAB is a quasi-minimal residual (QMR) variant of the Bi-CGSTAB algorithm [http://identifiers.org/biomodels.kisao/KISAO_0000394] of van der Vorst for solving nonsymmetric linear systems. The motivation for the QMR variant is to obtain smoother convergence behavior of the underlying method.