Geodesic
Periodic groups whose maximal abelian subgroups are either invariant or else invariantly complemented
Matematičeskie zametki, Tome 3 (1968) no. 1, pp. 39-44 
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/
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     author = {A. N. Fomin},
     title = {Periodic groups whose maximal abelian subgroups are either invariant or else invariantly complemented},
     journal = {Matemati\v{c}eskie zametki},
     pages = {39--44},
     year = {1968},
     volume = {3},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_1_a4/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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].