@article{IIMI_2002_2_a22,
     author = {L. I. Rodina and E. L. Tonkov},
     title = {The criterion of complete controllability of linear time-varying system in the critical case},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {81--86},
     year = {2002},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2002_2_a22/}
}