%0 Journal Article %A J. Peetre %T Remark on Eigenfunction Expansions for Elliptic Operators with Constant Coefficients. %J Mathematica Scandinavica %D 1964 %P 83-92 %V 15 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1964__15_165892/ %F MS2_1964__15_165892