@article{10_14736_kyb_2015_2_0335,
     author = {Tang, Yutao},
     title = {Output consensus of nonlinear multi-agent systems with unknown control directions},
     journal = {Kybernetika},
     pages = {335--346},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2015},
     doi = {10.14736/kyb-2015-2-0335},
     mrnumber = {3350566},
     zbl = {06487083},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.14736/kyb-2015-2-0335/}
}