@article{INTG_1988_20_a3,
     author = {A. A. Agrachev},
     title = {Quadratic mappings in geometric control theory},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {111--205},
     publisher = {mathdoc},
     volume = {20},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1988_20_a3/}
}