@article{FAA_1996_30_4_a14,
     author = {V. Yu. Ovsienko and C. Roger},
     title = {Extensions of the {Virasoro} {Group} and the {Virasoro} {Algebra} by {Modules} of {Tensor} {Densities} on $S^1$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {86--88},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1996_30_4_a14/}
}