  INFO    INTEGER
          = 0: succesful exit;
          = 1: B11 or B22 is a (numerically) singular matrix.

</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  The algorithm uses orthogonal transformations as described on page
  22 in [1], but with an improved implementation.

</PRE>
<A name="References"><B><FONT SIZE="+1">References</FONT></B></A>
<PRE>
  [1] Benner, P., Byers, R., Losse, P., Mehrmann, V. and Xu, H.
      Numerical Solution of Real Skew-Hamiltonian/Hamiltonian
    