        Roger Martin, James Wilkinson,<br>
          The Implicit QL Algorithm,<br>
          Numerische Mathematik,<br>
          Volume 12, Number 5, December 1968, pages 377-383.
        </li>
        <li>
          Arthur Stroud, Don Secrest,<br>
          Gaussian Quadrature Formulas,<br>
          Prentice Hall, 1966,<br>
          LC: QA299.4G3S7.
        </li>
      </ol>
    </p>

    <h3 align = "center">
      Source Code:
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