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@article{MAN_1961__142_160823, author = {F.E. BROWDER}, title = {On the spectcral theory of elliptic differential operators. {I.}}, journal = {Mathematische Annalen}, pages = {22--130}, publisher = {mathdoc}, volume = {142}, year = {1961}, url = {http://geodesic.mathdoc.fr/item/MAN_1961__142_160823/} }
F.E. BROWDER. On the spectcral theory of elliptic differential operators. I.. Mathematische Annalen, Tome 142 (1961), pp. 22-130. http://geodesic.mathdoc.fr/item/MAN_1961__142_160823/