@article{IIMI_2006_3_a62,
     author = {D. A. Sivkov},
     title = {On the error of constructing feedback of the minimal rank},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {135--136},
     year = {2006},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2006_3_a62/}
}