1. An Introduction to Econophysics: Correlations and Complexity in Finance;Mantegna,1999
2. Evolution, Money, War and Computers;Moss de Oliveira,1999
3. Why Stock Markets Crash (Critical Events in Complex Financial Systems);Sornette,2003
4. Finite-time singularity signature of hyperinflation;Sornette;Physica A,2003