%0 Journal Article %A Jorgen Christian Ridder Ebbesen %T Helical maps from LCA-groups into Hilbert spaces. %J Mathematica Scandinavica %D 1984 %P 271-284 %V 55 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1984__55_166919/ %F MS2_1984__55_166919