@article{SM_2022_213_5_a2,
     author = {I. A. Bogaevsky},
     title = {Asymptotic behaviour of the sphere and front of a~flat {sub-Riemannian} structure on the {Martinet} distribution},
     journal = {Sbornik. Mathematics},
     pages = {624--640},
     publisher = {mathdoc},
     volume = {213},
     number = {5},
     year = {2022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2022_213_5_a2/}
}