Afshin Abdollahi Massoud Pedram Symmetry Detection and Boolean Matching Utilizing a Signature-Based Canonical Form of Boolean Functions. 1128-1137 2008 27 IEEE Trans. on CAD of Integrated Circuits and Systems 6 http://dx.doi.org/10.1109/TCAD.2008.923256 db/journals/tcad/tcad27.html#AbdollahiP08