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@article{MS2_1990__66_1_167094, author = {F. Malikow}, title = {Singular vectors corresponding to imaginary roots in verma modules over affine {Lie} algebras.}, journal = {Mathematica Scandinavica}, pages = {73--90}, publisher = {mathdoc}, volume = {66}, number = {1}, year = {1990}, zbl = {0687.17009}, url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167094/} }
F. Malikow. Singular vectors corresponding to imaginary roots in verma modules over affine Lie algebras.. Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 73-90. http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167094/