Deformations of Poisson brackets and extensions of Lie algebras of contact vector fields
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 47 (1992) no. 6, pp. 135-191

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     author = {V. Yu. Ovsienko and C. Roger},
     title = {Deformations of {Poisson} brackets and extensions of {Lie} algebras of contact vector fields},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {135--191},
     publisher = {mathdoc},
     volume = {47},
     number = {6},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1992_47_6_a2/}
}
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V. Yu. Ovsienko; C. Roger. Deformations of Poisson brackets and extensions of Lie algebras of contact vector fields. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 47 (1992) no. 6, pp. 135-191. http://geodesic.mathdoc.fr/item/RM_1992_47_6_a2/