Volatility return intervals analysis of the Japanese market W.-S. Jung, F. Z. Wang, S. Havlin, T. Kaizoji, H.-T. Moon and H. E. Stanley Eur. Phys. J. B, 62 1 (2008) 113-119 Published online: 21 March 2008 DOI: 10.1140/epjb/e2008-00123-0