Geodesic
On projective invariant subgroups of Abelian groups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 6, pp. 211-218

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Properties of projective invariant subgroups are studied. The structure of these subgroups in nonreduced groups is described. The conditions under which projective invariant subgroups are fully invariant are considered. 
@article{FPM_2008_14_6_a11,
     author = {A. R. Chekhlov},
     title = {On projective invariant subgroups of {Abelian} groups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {211--218},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_6_a11/}
}
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A. R. Chekhlov. On projective invariant subgroups of Abelian groups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 6, pp. 211-218. http://geodesic.mathdoc.fr/item/FPM_2008_14_6_a11/