@article{AA_2009_21_2_a1,
     author = {M. Ilyin and P. Kulish and V. Lyakhovsky},
     title = {On the properties of branching coefficients for affine {Lie} groups},
     journal = {Algebra i analiz},
     pages = {52--70},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2009_21_2_a1/}
}