Geodesic
A Note on Split Extensions of Finite Groups
Canadian mathematical bulletin, Tome 24 (1981) no. 1, pp. 117-119

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Let N and K be finite groups with K acting on N, and let G be the semidirect product NK It was shown by Zassenhaus that if (|N|, |K|) — 1 and either N or K is solvable (an assumption later rendered redundant by the Feit-Thompson theorem), then all complements of N in G are conjugate to K. 
Pettet, Martin R. A Note on Split Extensions of Finite Groups. Canadian mathematical bulletin, Tome 24 (1981) no. 1, pp. 117-119. doi: 10.4153/CMB-1981-020-4
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     title = {A {Note} on {Split} {Extensions} of {Finite} {Groups}},
     journal = {Canadian mathematical bulletin},
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     year = {1981},
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     number = {1},
     doi = {10.4153/CMB-1981-020-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1981-020-4/}
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