%0 Journal Article %A Verriest, Erik I. %T New qualitative methods for stability of delay systems %J Kybernetika %D 2001 %P 229-238 %V 37 %N 3 %U http://geodesic.mathdoc.fr/item/KYB_2001_37_3_a1/ %G en %F KYB_2001_37_3_a1