Notes, Comments and Preliminary results Jul 24 2009 Matei Demetrescu   Panel unit root testing and the martingale difference hypothesis for German stocks   Abstract  Contact Information  Citation  Full Text  -  Note   Oct 17 2007 Matei Demetrescu   Volatility Clustering in High-Frequency Data: A self-fulfilling prophecy?   Abstract  Contact Information  Citation  Full Text  -  Note