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@article{AA_1991_3_3_a9, author = {D. V. Yur'ev}, title = {The algebra $\mathrm{Vert}(\mathbb C\mathrm{vir},c)$ of vertex operators for the {Virasoro} algebra}, journal = {Algebra i analiz}, pages = {197--205}, publisher = {mathdoc}, volume = {3}, number = {3}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1991_3_3_a9/} }
D. V. Yur'ev. The algebra $\mathrm{Vert}(\mathbb C\mathrm{vir},c)$ of vertex operators for the Virasoro algebra. Algebra i analiz, Tome 3 (1991) no. 3, pp. 197-205. http://geodesic.mathdoc.fr/item/AA_1991_3_3_a9/