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@article{MZM_1991_49_2_a4, author = {M. Ya. Zhitomirskii}, title = {Normal forms of germs of smooth distributions}, journal = {Matemati\v{c}eskie zametki}, pages = {36--44}, publisher = {mathdoc}, volume = {49}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_2_a4/} }
M. Ya. Zhitomirskii. Normal forms of germs of smooth distributions. Matematičeskie zametki, Tome 49 (1991) no. 2, pp. 36-44. http://geodesic.mathdoc.fr/item/MZM_1991_49_2_a4/