              the call to one of the LAPACK Library routines DGGEV
                or DGEEV (1 &lt;= j &lt;= 3). If INFO &lt; 3, the values
                returned in EVR(K), EVI(K), and EVQ(K) should be
                correct for K = INFO+1,...,3.

</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  A matrix pencil is built, whose eigenvalues are the roots of the
  given polynomial, and they are computed using the QZ algorithm.
  However, when the ratio between the largest and smalle