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The central ideas of this paper were developed while the author was a visitor at the Mathematics Department of the University of Chicago for four weeks during the Spring of 1985
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Harris, M.E. Filtrations, Stable Clifford Theory and Group-Graded Rings and Modules. Math Z 196, 497–510 (1987). https://doi.org/10.1007/BF01160891
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DOI: https://doi.org/10.1007/BF01160891