@article{TMF_1998_114_1_a1,
     author = {G. E. Arutyunov and S. A. Frolov},
     title = {Virasoro amplitude from the $S^N{\mathbf R}^{24}$-orbifold sigma model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {56--86},
     publisher = {mathdoc},
     volume = {114},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_114_1_a1/}
}