VELOCITY OF LASER GENERATED ULTRASOUND IN ISOTHERMALLY ANNEALED Fe81B13.5Si3.5C2 AMORPHOUS RIBBONS R. D. Greenough and M. Schulze J. Phys. Colloques, 49 C8 (1988) C8-1339-C8-1240 DOI: 10.1051/jphyscol:19888612