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The software package (in FORTRAN 77) for computing a GUPTRI form of
an arbitrary and error bounds for computed
generalized eigenvalues and reducing subspaces
was published in [121,122].
The software is developed for dense matrices stored as double precision
complex data. An interface to MATLAB in terms of a MEX-file is
also available. See the book's homepage, ETHOME, for access to this software.