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@article{MS2_1966__19_165970, author = {Erik Balslev}, title = {The {Singular} {Spectrum} of {Elliptic} {Differential} {Operators} in {Lp} {(Rn).}}, journal = {Mathematica Scandinavica}, pages = {193--210}, publisher = {mathdoc}, volume = {19}, year = {1966}, zbl = {0171.08501}, url = {http://geodesic.mathdoc.fr/item/MS2_1966__19_165970/} }
Erik Balslev. The Singular Spectrum of Elliptic Differential Operators in Lp (Rn).. Mathematica Scandinavica, Tome 19 (1966), pp. 193-210. http://geodesic.mathdoc.fr/item/MS2_1966__19_165970/