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@article{MAN_1965__162_161343, author = {N. DUNFORD}, title = {A {Spectral} {Theory} for {Certain} {Operators} on a {Direct} {Sum} of {Hilbert} {Spaces.}}, journal = {Mathematische Annalen}, pages = {294--330}, publisher = {mathdoc}, volume = {162}, year = {1965}, zbl = {0139.31202}, url = {http://geodesic.mathdoc.fr/item/MAN_1965__162_161343/} }
N. DUNFORD. A Spectral Theory for Certain Operators on a Direct Sum of Hilbert Spaces.. Mathematische Annalen, Tome 162 (1965), pp. 294-330. http://geodesic.mathdoc.fr/item/MAN_1965__162_161343/