      Master of Science Thesis,<br>
          Computer Science Department,<br>
          Iowa State University, 2005.
        </li>
        <li>
          William Briggs, Van Emden Henson,<br>
          The DFT: An Owner's Manual for the Discrete Fourier Transform,<br> 
          SIAM, 1995,<br>
          ISBN13: 978-0-898713-42-8,<br>
          LC: QA403.5.B75.
        </li>
        <li>
          Theodore Chihara,<br>
          An Introduction to Orthogonal Polynomials,<br>
          Gordon and Breach, 19