Optical investigations of the clathrate α-Eu8Ga16Ge30 J. Sichelschmidt, V. Voevodin, V. Pacheco, Yu. Grin, F. Steglich, T. Nishi and S. Kimura Eur. Phys. J. B, 46 3 (2005) 363-366 Published online: 18 August 2005 DOI: 10.1140/epjb/e2005-00265-5