enberg form.

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<A name="References"><B><FONT SIZE="+1">References</FONT></B></A>
<PRE>
  [1] Varga, A. and Sima, V.
      Numerically Stable Algorithm for Transfer Function Matrix
      Evaluation.
      Int. J. Control, vol. 33, nr. 6, pp. 1123-1133, 1981.

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<A name="Numerical Aspects"><B><FONT SIZE="+1">Numerical Aspects</FONT></B></A>
<PRE>
  The algorithm is numerically stable in practice and requires about
  20*N**3 floating point operations at most, but usually much less.

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