@article{GDZPPN002440970, title = {Subgroups of Hilbert spaces.}, journal = {Mathematische Zeitschrift}, volume = {209}, year = {1992}, pages = {657-670}, zbl = {0762.46015}, url = {http://dml.mathdoc.fr/item/GDZPPN002440970} }
Dobrowski, Tadeusz; Grabowski, Janusz. Subgroups of Hilbert spaces.. Mathematische Zeitschrift, Tome 209 (1992) pp. 657-670. http://gdmltest.u-ga.fr/item/GDZPPN002440970/