         Peter Silvester,<br>
          Symmetric Quadrature Formulae for Simplexes,<br>
          Mathematics of Computation,<br>
          Volume 24, Number 109, January 1970, pages 95-100.
        </li>
      </ol>
    </p>

    <h3 align = "center">
      Source Code:
    </h3>

    <p>
      <ul>
        <li>
          <a href = "tetrahedron_nco_degree.m">tetrahedron_nco_degree.m</a>
          returns the degree of a given NCO rule for the tetrahedron.
        </li>
        <li>
          <a href = "te