@article{MZ_1994__215_1_174607,
     author = {W. Banaszczyk and M.J. Chasco},
     title = {Open subgroups and {Pontryagin} duality.},
     journal = {Mathematische Zeitschrift},
     pages = {195--204},
     year = {1994},
     volume = {215},
     number = {1},
     zbl = {0790.22001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__215_1_174607/}
}