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Research supported by National Science Foundation Grant NSF-GP-6558, and by a Senior Faculty Fellowship from Yale University.
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Seligman, G.B. On some commutative unipotent groups. Invent Math 5, 129–137 (1968). https://doi.org/10.1007/BF01425544
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DOI: https://doi.org/10.1007/BF01425544