@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/}
}