@article{MOMA_1972__76_177616,
     author = {L.C. Graue},
     title = {On a {Theorem} of {Gersgorin.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {398--409},
     publisher = {mathdoc},
     volume = {76},
     year = {1972},
     zbl = {0254.15012},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1972__76_177616/}
}