          ISBN: 0-19-850672-4,<br>
          LC: QA404.5 G3555.
        </li>
        <li>
          Ralph Hartley,<br>
          A More Symmetrical Fourier Analysis Applied to Transmission 
          Problems,<br>
          Proceedings of the Institute of Radio Engineers,<br>
          Volume 30, 1942, pages 144-150.
        </li>
        <li>
          Brian Hayes,<br>
          The Vibonacci Numbers,<br>
          American Scientist,<br>
          Volume 87, Number 4, July-August 1999, pages 296-301.
   