@article{IM_1980__62_142765,
     author = {V.G. Kac and I.B. Frenkel},
     title = {Basic {Representations} of {Affine} {Lie} {Algebras} and {Dual} {Resonance} {Models.}},
     journal = {Inventiones mathematicae},
     pages = {23--66},
     publisher = {mathdoc},
     volume = {62},
     year = {1980},
     zbl = {0493.17010},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__62_142765/}
}