Geodesic
Periodic groups whose maximal abelian subgroups are either invariant or else invariantly complemented
Matematičeskie zametki, Tome 3 (1968) no. 1, pp. 39-44.

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In this paper we show that groups, all of whose maximal abelian subgroups are either normal or have a normal complement, are solvable and their degree of solvability is not higher than four. Periodic groups with the above property are locally finite. For a short description of these groups, see [5]. 
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     title = {Periodic groups whose maximal abelian subgroups are either invariant or else invariantly complemented},
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A. N. Fomin. Periodic groups whose maximal abelian subgroups are either invariant or else invariantly complemented. Matematičeskie zametki, Tome 3 (1968) no. 1, pp. 39-44. http://geodesic.mathdoc.fr/item/MZM_1968_3_1_a4/