Weight multiplicity polynomials for affine Kac-Moody algebras of type A r
Compositio Mathematica, Tome 104 (1996) no. 2, pp. 153-187. 
@article{CM_1996__104_2_153_0,
     author = {Benkart, Georgia and Kang, Seok-Jin and Misra, Kailash C.},
     title = {Weight multiplicity polynomials for affine {Kac-Moody} algebras of type $A_r$},
     journal = {Compositio Mathematica},
     pages = {153--187},
     publisher = {Kluwer Academic Publishers},
     volume = {104},
     number = {2},
     year = {1996},
     mrnumber = {1421398},
     zbl = {0862.17016},
     language = {en},
     url = {http://www.numdam.org/item/CM_1996__104_2_153_0/}
}
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Benkart, Georgia; Kang, Seok-Jin; Misra, Kailash C. Weight multiplicity polynomials for affine Kac-Moody algebras of type $A_r$. Compositio Mathematica, Tome 104 (1996) no. 2, pp. 153-187. http://www.numdam.org/item/CM_1996__104_2_153_0/

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