@article{NUMA_1993__65_4_133740,
     author = {Ji-guang Sun},
     title = {Backward perturbation analysis of certian characteristic subspaces.},
     journal = {Numerische Mathematik},
     pages = {357--382},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {1993},
     zbl = {0791.65023},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__65_4_133740/}
}