@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/