Ismo Hänninen Jarmo Takala Radix-4 Recoded Multiplier on Quantum-Dot Cellular Automata. 118-127 2009 SAMOS http://dx.doi.org/10.1007/978-3-642-03138-0_13 conf/samos/2009 db/conf/samos/samos2009.html#HanninenT09