@article{NUMA_1983__41_132853,
     author = {J. Sun},
     title = {The {Perturbation} {Bounds} for {Eigenspaces} of a {Definite} {Matrix-Pair}},
     journal = {Numerische Mathematik},
     pages = {321--344},
     publisher = {mathdoc},
     volume = {41},
     year = {1983},
     zbl = {0487.65021},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1983__41_132853/}
}