@article{10_4153_CJM_1991_001_0,
     author = {Benabdallah, K. and Charles, B. and Mader, A.},
     title = {Vertical {Subgroups} of {Primary} {Abelian} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {3--18},
     year = {1991},
     volume = {43},
     number = {1},
     doi = {10.4153/CJM-1991-001-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-001-0/}
}