@article{INTO_1999_64_a3,
     author = {B. Bonnard and G. Launay and E. Tr\'elat},
     title = {The transcendence required for computing the sphere and wave front in the {Martinet} {sub-Riemannian} geometry},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {82--117},
     publisher = {mathdoc},
     volume = {64},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_1999_64_a3/}
}