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Partially supported by the National Science Foundation grant # DMS820-1680 and DMS 8601161.
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DeConcini, C., Goresky, M., MacPherson, R. et al. On the geometry of quadrics and their degenerations. Commentarii Mathematici Helvetici 63, 337–413 (1988). https://doi.org/10.1007/BF02566772
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DOI: https://doi.org/10.1007/BF02566772