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Supported in part by grants from the National Science Foundation. (MCS-8104265 and MCS 8202127)
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Lusztig, G., Vogan, D.A. Singularities of closures ofK-orbits on flag manifolds. Invent Math 71, 365–379 (1983). https://doi.org/10.1007/BF01389103
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DOI: https://doi.org/10.1007/BF01389103