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Partially supported by NSF grant 82-00752
Part of the research was done while the author was on leave from Tata Institute, Bombay to Australian National University, Canberra
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Deodhar, V.V. On some geometric aspects of Bruhat orderings. I. A finer decomposition of Bruhat cells. Invent Math 79, 499–511 (1985). https://doi.org/10.1007/BF01388520
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DOI: https://doi.org/10.1007/BF01388520