7Bowman Adrian, Adelchi Azzalini, 1997, Applied Smoothing Techniques for Data Analysis: the Kernel Approach with SPlus Illustration [ M ], Oxford University Press, New York.
8Cai Zongwu, 2007, Nonparametric Econometrics : Theory and Applications, University of North Carolina and Xiamen University, manuscript.
9Chamberlain Gary, Michael Rothschild, 1983, Arbitrage, Factor Structure and Mean Variance Analysis in Large Asset Markets [ J ], Econometrica, 51 (5) :1281 - 1304.
