@article{MM2_1979__30_154688,
     author = {I. Gohberg and E. Azoff and K. Clancey},
     title = {On the {Spectra} of {Finite-Dimensional} {Pertobations} of {Matrix} {Multiplication} {Operators.}},
     journal = {Manuscripta mathematica},
     pages = {351--360},
     publisher = {mathdoc},
     volume = {30},
     year = {1979},
     zbl = {0436.47042},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__30_154688/}
}