@article{MAN_1988__282_2_164479,
     author = {S. Kantorovitz and R. J. Hughes},
     title = {Spectral {Representations} for {Unbounded} {Operators} with {Real} {Spectrum.}},
     journal = {Mathematische Annalen},
     pages = {535--544},
     publisher = {mathdoc},
     volume = {282},
     number = {2},
     year = {1988},
     zbl = {0632.47030},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164479/}
}