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@article{MAN_1968__178_161740, author = {J.I. NIETO}, title = {On the {Essential} {Spectrum} of {Symmetrizable} {Operators.}}, journal = {Mathematische Annalen}, pages = {145--153}, publisher = {mathdoc}, volume = {178}, year = {1968}, zbl = {0164.16401}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__178_161740/} }
J.I. NIETO. On the Essential Spectrum of Symmetrizable Operators.. Mathematische Annalen, Tome 178 (1968), pp. 145-153. http://geodesic.mathdoc.fr/item/MAN_1968__178_161740/