@article{TMF_2008_156_3_a4,
     author = {A. V. Lebedev and D. A. Leites},
     title = {Shapovalov determinant for loop superalgebras},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {378--397},
     publisher = {mathdoc},
     volume = {156},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2008_156_3_a4/}
}