@article{ELA_2011__22__a43,
     author = {Castro-Gonzalez, N. and Martinez-Serrano, M.F. and Robles, J.},
     title = {An extension of the perturbation analysis for the {Drazin} inverse},
     journal = {The electronic journal of linear algebra},
     pages = {539--556},
     publisher = {mathdoc},
     volume = {22},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2011__22__a43/}
}