%0 Journal Article
%A V. A. Yakubovich
%T Frequency criteria for invariance up to $\varepsilon$ of control systems with one nonlinear block
%J Doklady Akademii Nauk
%D 1978
%P 283-286
%V 240
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_240_2_a9/
%G ru
%F DAN_1978_240_2_a9