esulting diagonal blocks of the matrices A and B.

  ALPHA   (output) COMPLEX*16 array, dimension (N)
  BETA    (output) COMPLEX*16 array, dimension (N)
          If INFO = 0, then ALPHA(j)/BETA(j), j = 1, ..., N, are
          the generalized eigenvalues of the matrix pair (A, B)
          (the diagonals of the complex Schur form).
          All BETA(j) are non-negative real numbers.
          The quotients ALPHA(j)/BETA(j) may easily over- or
          underflow, and BETA(j) may even be zero. Thus, the us