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This work, supported by a Fleming Award of the Ministerio de Educaci6n y Ciencia of Spain was modelled at the Mathematics Institute of the University of Warwick (England). The author wishes to express his acknowledgement to all members of the staff of this Institute for their hospitality. Especially many thanks are due Dr. T. O. Hawkes for providing some reference material and for some friendly conversations.
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Ezquerro, L.M. On generalized covering subgroups and normalizers of finite soluble groups. Arch. Math 47, 385–394 (1986). https://doi.org/10.1007/BF01189976
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DOI: https://doi.org/10.1007/BF01189976