Robert Hartwig, Xiezhang Li, Yimin Wei. Representations for the Drazin Inverse of a 2 x 2 Block Matrix. SIAM J. Matrix Analysis Applications, 27(3):757-771, 2005. [doi]
@article{HartwigLW05,
title = {Representations for the Drazin Inverse of a 2 x 2 Block Matrix},
author = {Robert Hartwig and Xiezhang Li and Yimin Wei},
year = {2005},
doi = {10.1137/040606685},
url = {http://dx.doi.org/10.1137/040606685},
researchr = {https://researchr.org/publication/HartwigLW05},
cites = {0},
citedby = {0},
journal = {SIAM J. Matrix Analysis Applications},
volume = {27},
number = {3},
pages = {757-771},
}