Rosa Rodríguez-Montañés Joan Figueras Bridges in sequential CMOS circuits: current-voltage signatur. 68-73 1997 conf/vts/1997 VTS http://csdl.computer.org/comp/proceedings/vts/1997/7810/00/78100068abs.htm db/conf/vts/vts1997.html#Rodriguez-MontanesF97