FAR INFRARED ABSORPTION IN ULTRAFINE AL PARTICLES DRUDE MODEL VERSUS GOR'KOV-ÉLIASHBERG THEORY C. G. GRANQVIST, R. A. BUHRMAN, J. WYNS and A. J. SIEVERS J. Phys. Colloques, 38 C2 (1977) C2-93-C2-96 DOI: 10.1051/jphyscol:1977219