@article{GDZPPN002442450, title = {Open subgroups and Pontryagin duality.}, journal = {Mathematische Zeitschrift}, volume = {217}, year = {1994}, pages = {195-204}, zbl = {0790.22001}, url = {http://dml.mathdoc.fr/item/GDZPPN002442450} }
Banaszczyk, W.; Chasco, M.J. Open subgroups and Pontryagin duality.. Mathematische Zeitschrift, Tome 217 (1994) pp. 195-204. http://gdmltest.u-ga.fr/item/GDZPPN002442450/