 Aspects"><B><FONT SIZE="+1">Numerical Aspects</FONT></B></A>
<PRE>
  The algorithm requires ( 16*K + 32*N + 42 )*N*NB +
  ( 16*K + 112*N - 208/3*NB - 69 )*NB*NB - 29/3*NB floating point
  operations and is numerically backward stable.

</PRE>
<A name="References"><B><FONT SIZE="+1">References</FONT></B></A>
<PRE>
  [1] Benner, P., Mehrmann, V., and Xu, H.
      A numerically stable, structure preserving method for
      computing the eigenvalues of real Hamiltonian or symplectic
      pencils.
      Numer.