Olaf Schenk Stefan Röllin Anshul Gupta The effects of unsymmetric matrix permutations and scalings in semiconductor device and circuit simulation. 400-411 2004 23 IEEE Trans. on CAD of Integrated Circuits and Systems 3 http://doi.ieeecomputersociety.org/10.1109/TCAD.2004.823345 db/journals/tcad/tcad23.html#SchenkRG04