%0 Journal Article %A Ya. Z. Tsypkin %T A criterion of absolute stability for sampled-data systems with monotone characteristics of the non-linear element %J Doklady Akademii Nauk %D 1964 %P 1029-1032 %V 155 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1964_155_5_a8/ %G ru %F DAN_1964_155_5_a8