@article{PORMA_1989__46_2_115660,
     author = {Marques de S\'a, Eduardo},
     title = {The rank of the difference of similar matrices},
     journal = {Portugaliae mathematica},
     pages = {177--187},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1989},
     mrnumber = {1020965},
     zbl = {0682.15002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_2_115660/}
}