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Dedicated toWolfgang Gaschütz on his 60th birthday
The first author acknowledges the hospitality of the University of Warwick while this work was being done.
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McCaughan, D.J., Stonehewer, S.E. Finite soluble groups whose subnormal subgroups have defect at most two. Arch. Math 35, 56–60 (1980). https://doi.org/10.1007/BF01235317
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DOI: https://doi.org/10.1007/BF01235317