%0 Journal Article %A Tang, Yutao %T Output consensus of nonlinear multi-agent systems with unknown control directions %J Kybernetika %D 2015 %P 335-346 %V 51 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14736/kyb-2015-2-0335/ %R 10.14736/kyb-2015-2-0335 %G en %F 10_14736_kyb_2015_2_0335