Network topology of an experimental futures exchange S. C. Wang, J. J. Tseng, C. C. Tai, K. H. Lai, W. S. Wu, S. H. Chen and S. P. Li Eur. Phys. J. B, 62 1 (2008) 105-111 Published online: 21 March 2008 DOI: 10.1140/epjb/e2008-00119-8