_2d.m">quadrature_test_2d.m</a>,
          the source code.
        </li>
      </ul>
    </p>

    <h3 align = "center">
      Examples and Tests:
    </h3>

    <p>
      <b>PRODUCT_RULE_GL</b> is a family of Gauss_Legendre product rules which
      includes 2D rules of orders 1x1, 2x2, 4x4,
      8x8, 16x16 and 32x32.
      <ul>
        <li>
          <a href = "../../datasets/product_rule_gl/product_rule_gl.html">
          product_rule_gl.html</a>,
          describes the Gauss-Legendre product rules.
