LEX*16 array, dimension (LDA,N)
          On entry, the leading N-by-N upper triangular part of this
          array must contain the upper triangular matrix A in the
          generalized complex Schur form, as returned by the LAPACK
          Library routine ZGGES. The strictly lower triangular part
          is used as workspace.
          On exit, the leading N-by-N upper triangular part of
          this array contains the computed block-diagonal matrix,
          corresponding to the given matrix A. T