INTERNAL FRICTION AS MEASUREMENT OF MOBILE DEFECTS DENSITY DURING DEFORMATION OF GLASSY POLYCARBONATE J. Parisot, O. Rafi et W. J. ChoiJ. Phys. Colloques, 44 C9 (1983) C9-177-C9-184DOI: https://doi.org/10.1051/jphyscol:1983922