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@article{AA_1994_6_3_a0, author = {V. I. Arnol'd}, title = {Topological properties of {Legendre} projections in contact geometry of wave fronts}, journal = {Algebra i analiz}, pages = {1--16}, publisher = {mathdoc}, volume = {6}, number = {3}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1994_6_3_a0/} }
V. I. Arnol'd. Topological properties of Legendre projections in contact geometry of wave fronts. Algebra i analiz, Tome 6 (1994) no. 3, pp. 1-16. http://geodesic.mathdoc.fr/item/AA_1994_6_3_a0/