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@article{MS2_1957__5_165664, author = {GUNNAR BERGENDAL}, title = {On spectral functions belonging to an elliptic differential operator with variable coefficients}, journal = {Mathematica Scandinavica}, pages = {241--254}, publisher = {mathdoc}, volume = {5}, year = {1957}, zbl = {0080.30701}, url = {http://geodesic.mathdoc.fr/item/MS2_1957__5_165664/} }
GUNNAR BERGENDAL. On spectral functions belonging to an elliptic differential operator with variable coefficients. Mathematica Scandinavica, Tome 5 (1957), pp. 241-254. http://geodesic.mathdoc.fr/item/MS2_1957__5_165664/