Hirokatsu Shirahama Akira Mochizuki Takahiro Hanyu Masami Nakajima Kazutami Arimoto Design of a Processing Element Based on Quaternary Differential Logic for a Multi-Core SIMD Processor. 43 2007 ISMVL http://dx.doi.org/10.1109/ISMVL.2007.14 conf/ismvl/2007 db/conf/ismvl/ismvl2007.html#ShirahamaMHNA07