Abhranil Maiti Raghunandan Nagesh Anand Reddy Patrick Schaumont Physical unclonable function and true random number generator: a compact and scalable implementation. 425-428 2009 ACM Great Lakes Symposium on VLSI http://doi.acm.org/10.1145/1531542.1531639 conf/glvlsi/2009 db/conf/glvlsi/glvlsi2009.html#MaitiNRS09