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@article{MZM_1981_29_6_a15, author = {A. N. Varchenko}, title = {Obstructions to local equivalence of distributions}, journal = {Matemati\v{c}eskie zametki}, pages = {939--947}, publisher = {mathdoc}, volume = {29}, number = {6}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_6_a15/} }
A. N. Varchenko. Obstructions to local equivalence of distributions. Matematičeskie zametki, Tome 29 (1981) no. 6, pp. 939-947. http://geodesic.mathdoc.fr/item/MZM_1981_29_6_a15/