ELA, Volume 9, pp. 129-131, August 2002, abstract.
Integral Representation of the Drazin Inverse
N. Castro Gonzalez, J.J. Koliha, and Yimin Wei
In this note we present an integral representation for
the Drazin inverse A^D of a complex square matrix A.
This representation does not require any restriction
on its eigenvalues.