Samir Roy U. Maulik Biplab K. Sikdar Exploiting Ghost-FSMs as a BIST Structure for Sequential Machines. 155-160 2003 conf/vlsid/2003 VLSI Design http://csdl.computer.org/comp/proceedings/vlsid/2003/1868/00/18680155abs.htm db/conf/vlsid/vlsid2003.html#RoyMS03