@article{MZ_1970__116_171394,
     author = {C.R. Putnam},
     title = {An {Inequality} for the {Area} of {Hyponormal} {Spectra.}},
     journal = {Mathematische Zeitschrift},
     pages = {323--330},
     publisher = {mathdoc},
     volume = {116},
     year = {1970},
     zbl = {0197.10102},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__116_171394/}
}