@article{10_1007_s10587_013_0070_9,
     author = {Burciu, Sebastian},
     title = {Subgroups of odd depth{\textemdash}a necessary condition},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1039--1048},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {2013},
     doi = {10.1007/s10587-013-0070-9},
     mrnumber = {3165513},
     zbl = {1299.20001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-013-0070-9/}
}