@article{1102806304,
author = {Hartwig, Robert E.},
title = {Schur's theorem and the Drazin inverse.},
journal = {Pacific J. Math.},
volume = {79},
number = {2},
year = {1978},
pages = { 133-138},
language = {en},
url = {http://dml.mathdoc.fr/item/1102806304}
}
Hartwig, Robert E. Schur's theorem and the Drazin inverse.. Pacific J. Math., Tome 79 (1978) no. 2, pp. 133-138. http://gdmltest.u-ga.fr/item/1102806304/