Geodesic
$CW$-groups
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 27-31 
S. Yu. Maksimov. $CW$-groups. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 27-31. http://geodesic.mathdoc.fr/item/VMUMM_1982_1_a7/
@article{VMUMM_1982_1_a7,
     author = {S. Yu. Maksimov},
     title = {$CW$-groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {27--31},
     year = {1982},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_1_a7/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

If a purely divisible group $G$ is a direct sum of $CW$-groups with countable Ulm invariants then any summand of $G$ has the same properties.