@Article{CH,
  author  = {R. W. Carter and T. O. Hawkes},
  title   = {The {$\F$}-normalizers of a finite soluble group},
  journal = {J. Alg.},
  volume  = 5,
  pages   = {175 -- 201},
  year    = 1967
}

@Book{DH,
  author    = {K. Doerk and T. O. Hawkes},
  title     = {Finite soluble groups},
  publisher = {Walter de Gruyter},
  year      = 1992
}

@Unpublished{EW,
  author  = {B. Eick and C. R. B. Wright},
  title   = { Computing subgroups by exhibition in finite solvable groups},
  note    = {To appear in J. Symbolic Comp.}
}

@Article{G,
  author  = {W. Gasch\"utz},
  title   = {Zur Theorie der endlichen aufl\"osbaren Gruppen},
  journal = {Math. Z.},
  volume  = 80,
  pages   = {300 -- 305},
  year    = 1963
  }

@Article{WA,
  author  = {C. R. B. Wright},
  title   = {An internal approach to covering groups},
  journal = {J. Alg.},
  volume  = 25,
  pages   = {128 -- 145},
  year    = 1973
}

@Article{WB,
  author  = {C. R. B. Wright},
  title   = {On internal formation theory},
  journal = {Math. Z.},
  volume  = 134,
  pages   = {1 -- 9},
  year    = 1973
}