@article{TM_2004_245_a6,
     author = {D. M. Belov},
     title = {On {a~String} {Product} in {Witten's} {String} {Field} {Theory}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {65--71},
     publisher = {mathdoc},
     volume = {245},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2004_245_a6/}
}