_representation.html">
      GRAPH_REPRESENTATION</a>,
      a data directory of examples which
      representing abstract mathematical graphs in various ways.
    </p>

    <p>
      <a href = "../../data/grf/grf.html">
      GRF</a>,
      a data directory which
      contains a description of the GRF format and some examples.
    </p>

    <p>
      <a href = "../../m_src/grf_display/grf_display.html">
      GRF_DISPLAY</a>,
      a MATLAB program which
      reads a GRF file defining a mathematical gra