1.[篇名]Testing for Heteroscedasticity in Nonlinear Regression Models
   [作者] [url=]Jin-Guan Lin; Bo-Cheng Wei[/url]   
   [刊名] Communications in Statistics. A, Theory and Methods;  Vol.32; No.1; 2003
   [链接] http://www.informaworld.com/smpp/content~content=a713733058&db=all

2.[篇名]Testing for Linear and Nonlinear Granger Causality in the Stock Price- Volume Relation
   [作者]Craig Hiemstra and Jonathan D. Jones
   [刊名]The Journal of Finance
   [链接]http://www.jstor.org/pss/2329266