Peter Celinski Said F. Al-Sarawi Derek Abbott José Francisco López Low depth carry lookahead addition using charge recycling threshold logic. 469-472 2002 ISCAS (1) http://doi.ieeecomputersociety.org/10.1109/ISCAS.2002.1009879 db/conf/iscas/iscas2002-1.html#CelinskiAAL02