ULTRASONIC SPECTROSCOPY IN CROSS-PLY FIBER REINFORCED COMPOSITES APPLIED TO DISPERSION EFFECTS CHARACTERIZATION OF ELASTIC SHEAR WAVE T. LHERMITTE, B. PERRIN et M. FINKJ. Phys. Colloques, 51 C2 (1990) C2-1265-C2-1268DOI: https://doi.org/10.1051/jphyscol:19902297