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This work was partially supported by a grant from the U. S. National Science Foundation.
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Shult, E.E., Thas, J.A. Hyperplanes of dual polar spaces and the spin module. Arch. Math 59, 610–623 (1992). https://doi.org/10.1007/BF01194855
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DOI: https://doi.org/10.1007/BF01194855