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@article{MS2_1964__15_165892, author = {J. Peetre}, title = {Remark on {Eigenfunction} {Expansions} for {Elliptic} {Operators} with {Constant} {Coefficients.}}, journal = {Mathematica Scandinavica}, pages = {83--92}, publisher = {mathdoc}, volume = {15}, year = {1964}, zbl = {0131.09802}, url = {http://geodesic.mathdoc.fr/item/MS2_1964__15_165892/} }
J. Peetre. Remark on Eigenfunction Expansions for Elliptic Operators with Constant Coefficients.. Mathematica Scandinavica, Tome 15 (1964), pp. 83-92. http://geodesic.mathdoc.fr/item/MS2_1964__15_165892/