\begin{thebibliography}{1}
\providecommand{\url}[1]{\texttt{#1}}
\providecommand{\urlprefix}{URL }

\bibitem{EXTJS}
Extjs layout tutorial (August 2010),
  \url{http://www.sencha.com/learn/Tutorial:Using_Layouts_with_Ext_-_Part_1}

\bibitem{Java}
Java gridlayout tutorial (August 2010),
  \url{http://download.oracle.com/javase/tutorial/uiswing/layout/grid.html}

\bibitem{QT}
Nokia qt official website (August 2010), \url{http://qt.nokia.com/}

\bibitem{QTLayout}
Qt layout tutorial (August 2010), \url{http://doc.qt.nokia.com/4.6/layout.html}

\bibitem{Samara:2003}
Samara, T.: Making and Breaking the Grid: A Graphic Design Layout Workshop.
  Rockport Publishers (2003)

\end{thebibliography}