Meng Zhang Yi Zhang Kuo Zhao Liang Hu Automata for Weak Factor Recognition. 1771-1776 2008 ICYCS http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=4708921&arnumber=4709242&count=553&index=320 conf/icycs/2008 db/conf/icycs/icycs2008.html#ZhangZZH08