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Supported in part by NSF grant MPS 72-05055 A03 and Tata Institute, Bombay
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Deodhar, V.V. Some characterizations of Bruhat ordering on a Coxeter group and determination of the relative Möbius function. Invent Math 39, 187–198 (1977). https://doi.org/10.1007/BF01390109
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DOI: https://doi.org/10.1007/BF01390109