\begin{thebibliography}{1}

\bibitem{buhl}
H.~R. Buhl.
\newblock {\em Creative Engineering Design}.
\newblock The Iowa State University Press, 1960.

\bibitem{cross}
N.~Cross.
\newblock {\em Engineering Design Methods}.
\newblock John Wiley \& Sons, 1994.

\bibitem{dym}
C.~L. Dym.
\newblock {\em Engineering Design}.
\newblock Cambridge University Press, 1994.

\bibitem{hubka}
V.~Hubka.
\newblock {\em Principles of Engineering Design}.
\newblock Butterworth Scientific, 1982.

\bibitem{ray}
R.~C. Johnson.
\newblock {\em Mechanical Design Synthesis}.
\newblock Robert E. Krieger Publishing Company, 1978.

\bibitem{king}
W.~R. King.
\newblock {\em New Product Development and Introduction}.
\newblock McGraw-Hill, 1974.

\bibitem{pahl}
G.~Pahl and W.~Beitz.
\newblock {\em Engineering Design}.
\newblock Springer-Verlag, 1991.

\bibitem{walton}
J.~W. Walton.
\newblock {\em Engineering Design}.
\newblock West Publishing, 1991.

\end{thebibliography}
