\vspace{2cm}
{\Large\bf References}

\begin{description}\sloppy
\item[H{\"a}rdle, W.] (1991),
{\em Smoothing Techniques:  With Implementation in S},
New York: Springer.
\item[Pudney, S.] (1993),
Income and Wealth Inequality and the Life Cycle:
A Nonparametric Analysis for China,
{\em Journal of Applied Econometrics} 8: 249--276.
\end{description}
                            
