@article{RM_2010_65_4_a9,
     author = {I. V. Zakalyukin},
     title = {Singularities of control systems under degeneration of non-holonomic constraints},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {791--793},
     year = {2010},
     volume = {65},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2010_65_4_a9/}
}