g Quadrature,<br>
          Communications of the ACM,<br>
          June 1969, Volume 12, page 324.
        </li>
        <li>
          George Wallick,<br>
          Remark on Algorithm 351: Modified Romberg Quadrature,<br>
          Communications of the ACM,<br>
          June 1970, Volume 13, Issue 6, page 374-376.
        </li>
      </ol>
    </p>

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

    <p>
      <ul>
        <li>
          <a href = "toms351.f">toms351.f</a>, the source code.
  