Notes, Comments and Preliminary results Feb 19 2004 AHAMADA IBRAHIM   A complementary test for the KPSS test with an application to the US Dollar/Euro exchange rate   Abstract  Contact Information  Citation  Full Text  -  Note   Dec 12 2003 AHAMADA IBRAHIM   Non stationarity characteristics of the S\&P500 returns:An approach based on the evolutionary spectral density.   Abstract  Contact Information  Citation  Full Text  -  Note