Yousuke Nakamura Kei Hiraki Highly Fault-Tolerant FPGA Processor by Degrading Strategy. 75-80 2002 conf/prdc/2002 PRDC http://csdl.computer.org/comp/proceedings/prdc/2002/1852/00/18520075abs.htm db/conf/prdc/prdc2002.html#NakamuraH02