Free-volume hole distributions of polymers by positron annihilation lifetime spectroscopy G.H. DAI, Q. DENG, J. LIU, H. SHI, C.M. HUANG et Y.C. JEAN J. Phys. IV France, 03 C4 (1993) C4-233-C4-239 DOI: 10.1051/jp4:1993435