@article{MAN_1960__141_160804,
     author = {V. KBISHNAMURTHY},
     title = {On the state of a linear operator and its adjoint.},
     journal = {Mathematische Annalen},
     pages = {153--160},
     publisher = {mathdoc},
     volume = {141},
     year = {1960},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1960__141_160804/}
}