Geodesic
Finite Groups with Normal Normalizers
Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 1256-1260

Voir la notice de l'article provenant de la source Cambridge University Press

We say that a finite group G has property N if the normalizer of every subgroup of G is normal in G. Such groups are nilpotent since every Sylow subgroup is normal (the normalizer of a Sylow subgroup is its own normalizer). Thus it is sufficient to study p-groups which have property N. Note that property N is inherited by subgroups and factor groups. 
Hobby, C. Finite Groups with Normal Normalizers. Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 1256-1260. doi: 10.4153/CJM-1968-121-8
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