Yi-Min Wei

Hartwig, R. E., Wang, G. R., & Wei, Y. M. (2001). Some additive results on Drazin inverse. LINEAR ALGEBRA AND ITS APPLICATIONS, 322(1-3), 207–217. https://doi.org/10.1016/S0024-3795(00)00257-3

Wei, Y.-M., & Wang, G. R. (1997). The perturbation theory for the drazin inverse and its applications. Linear Algebra and Its Applications, 258(1997 June), 179–186.