@article{JRAM_1977__295_151928,
     author = {Wolfgang Gasch\"utz},
     title = {Subgroup criteria for an abelian group.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {214--220},
     publisher = {mathdoc},
     volume = {295},
     year = {1977},
     zbl = {0356.20001},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1977__295_151928/}
}