                                                       (D  C)

  to one with the same invariant zeros and with D of full row rank.
  The normal rank of the transfer-function matrix is the rank of D.

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<A name="References"><B><FONT SIZE="+1">References</FONT></B></A>
<PRE>
  [1] Svaricek, F.
      Computation of the Structural Invariants of Linear
      Multivariable Systems with an Extended Version of
      the Program ZEROS.
      System & Control Letters, 6, pp. 261-266, 1985.

  [2] Emami-Naeini, A