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@article{MZ_1968__103_170895, author = {Henri Joris}, title = {On {Bochner's} {Theorem} on the {Critical} {Index} for {Multiple} {Fourier} {Series.}}, journal = {Mathematische Zeitschrift}, pages = {61--66}, publisher = {mathdoc}, volume = {103}, year = {1968}, zbl = {0165.39603}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170895/} }
Henri Joris. On Bochner's Theorem on the Critical Index for Multiple Fourier Series.. Mathematische Zeitschrift, Tome 103 (1968), pp. 61-66. http://geodesic.mathdoc.fr/item/MZ_1968__103_170895/