&lt; 0:  if INFO = -i, the i-th argument had an illegal
                value;
          = 1:  the reduction algorithm failed. The block Toeplitz
                matrix associated with [ T  TA ] / [ T'  TA' ]' is
                not (numerically) positive definite.

</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  Householder transformations and modified hyperbolic rotations
  are used in the Schur algorithm [1], [2].

</PRE>
<A name="References"><B><FONT SIZE="+1">References</FONT><