@article{ARM_2003__39_3_a4,
     author = {Tian, Yongge},
     title = {How to characterize commutativity equalities for {Drazin} inverses of matrices},
     journal = {Archivum mathematicum},
     pages = {191--199},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {2003},
     mrnumber = {2010720},
     zbl = {1122.15300},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2003__39_3_a4/}
}