%0 Journal Article %A Ole Rask Jensen %T Construction of vacuum for the positive-energy representation and its Bose counterpart. %J Mathematica Scandinavica %D 1997 %P 101-106 %V 80 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1997__80_2_167414/ %F MS2_1997__80_2_167414