Michael T. Niemier Peter M. Kogge The "4-Diamond Circuit" - A Minimally Complex Nano-Scale Computational Building Block in QCA. 3-10 2004 conf/isvlsi/2004 ISVLSI http://csdl.computer.org/comp/proceedings/isvlsi/2004/2097/00/20970003abs.htm db/conf/isvlsi/isvlsi2004.html#NiemierK04