oncise Encyclopedia of Mathematics,<br>
          CRC Press, 2002,<br>
          Second edition,<br>
          ISBN: 1584883472,<br>
          LC: QA5.W45
        </li>
        <li>
          Stephen Wolfram,<br>
          The Mathematica Book,<br>
          Fourth Edition,<br>
          Cambridge University Press, 1999,<br>
          ISBN: 0-521-64314-7,<br>
          LC: QA76.95.W65.
        </li>
        <li>
          Daniel Zwillinger, editor,<br>
          CRC Standard Mathematical Tables and Formulae