An iterative method to compute the sign function of a non-Hermitian matrix and its application to the overlap Dirac operator at nonzero chemical potential.

Jacques Bloch Andreas Frommer Bruno Lang Tilo Wettig An iterative method to compute the sign function of a non-Hermitian matrix and its application to the overlap Dirac operator at nonzero chemical potential. 933-943 2007 177 Computer Physics Communications 12 http://dx.doi.org/10.1016/j.cpc.2007.07.012 db/journals/cphysics/cphysics177.html#BlochFLW07