Geodesic
When is the multiplicity of a weight equal to 1?
Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 4, pp. 1-13.

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A. D. Berenshtein; A. V. Zelevinskii. When is the multiplicity of a weight equal to 1?. Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 4, pp. 1-13. http://geodesic.mathdoc.fr/item/FAA_1990_24_4_a0/

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[6] Lusztig G., “Singularities, character formulas, and a $q$-analog of weight multiplicities”, Asterisque, 101–102 (1983), 208–227 | MR