Guang Zhang Bao Shi Clever Uses of Matrices for Neutral Delay Difference Systems. 417-421 2007 SNPD (1) http://doi.ieeecomputersociety.org/10.1109/SNPD.2007.204 conf/snpd/2007 db/conf/snpd/snpd2007-1.html#ZhangS07