Optical investigation of the metal-insulator transition in FeSb2 A. Perucchi, L. Degiorgi, Rongwei Hu, C. Petrovic and V. F. Mitrović Eur. Phys. J. B, 54 2 (2006) 175-183 Published online: 08 December 2006 DOI: 10.1140/epjb/e2006-00433-1