Optical investigations of the clathrate α-Eu8Ga16Ge30J. Sichelschmidt, V. Voevodin, V. Pacheco, Yu. Grin, F. Steglich, T. Nishi and S. KimuraEur. Phys. J. B, 46 3 (2005) 363-366DOI: https://doi.org/10.1140/epjb/e2005-00265-5