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@article{DAN_1989_304_1_a7, author = {I. M. Sonin}, title = {Separation of jets and generalization to the nonhomogeneous case}, journal = {Doklady Akademii Nauk}, pages = {36--40}, publisher = {mathdoc}, volume = {304}, number = {1}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_1_a7/} }
I. M. Sonin. Separation of jets and generalization to the nonhomogeneous case. Doklady Akademii Nauk, Tome 304 (1989) no. 1, pp. 36-40. http://geodesic.mathdoc.fr/item/DAN_1989_304_1_a7/