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Driver `dsdrv5` implements the Buckling transformation.
Eigenvalues closest to a shift
can be obtained by computing the selected eigenvalues
of

Settings of `which` are the same as those of the shift-invert modes.
This mode assumes that is a symmetric postive semi definite matrix.
Note that the operator `OP` is symmetric with respect to the
semi-inner product defined by The eigenvalue of the original problem and are
related by
Note that should not be used for this mode.
The two operations
are required in order to use this driver.

*Chao Yang*

*11/7/1997*