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To Helmut Wielandt, on his sixtieth birthday, 19 December, 1970
The author wishes to acknowledge the very kind hospitality of the University of British Columbia while this paper was in preparation.
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Roseblade, J.E. The derived series of a join of subnormal subgroups. Math Z 117, 57–69 (1970). https://doi.org/10.1007/BF01109828
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DOI: https://doi.org/10.1007/BF01109828