Electronic properties close to Dirac cone in two-dimensional organic conductor α-(BEDT-TTF)2I3 S. Katayama, A. Kobayashi and Y. Suzumura Eur. Phys. J. B, 67 2 (2009) 139-148 Published online: 22 January 2009 DOI: 10.1140/epjb/e2009-00020-0