@article{KYB_2001_37_5_a0,
     author = {Leon, J. de and Souleiman, I. and Glumineau, A. and Schreier, G.},
     title = {On nonlinear equivalence and backstepping observer},
     journal = {Kybernetika},
     pages = {521--546},
     year = {2001},
     volume = {37},
     number = {5},
     mrnumber = {1877072},
     zbl = {1265.93034},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2001_37_5_a0/}
}