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This work was carried out when the last named author visited the Department of Mathematics of the University of Napoli “Federico II” in March 1994. He is very grateful for the hospitality he enjoyed and for the support by the C.N.R.
The authors are indebted to the referee for pointing out a flaw in the proof of the last theorem.
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Franciosi, S., de Giovanni, F. & Heineken, H. On automorphisms fixing non-normal subgroups of groups. Arch. Math 65, 196–209 (1995). https://doi.org/10.1007/BF01195089
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DOI: https://doi.org/10.1007/BF01195089