CMRH method (Changing minimal residual with Hessenberg process) is an iterative

method for solving nonsymmetric linear systems. This method is similar to QMR method

but based on the Hessenberg process instead ...

In this paper, we present a nested splitting conjugate gradient (NSCG) iteration method for

solving a class of matrix equations with nonsymmetric coefficient matrices. This method is

actually inner/outer ...