Positronium inhibition and free volume in chloropolystyrenes studied by positron annihilation A. BARANOWSKI, M. DEBOWSKA, K . JERIE, G. MIRKIEWICZ, J. RUDZINSKA-GIRULSKA et R. TADEUSZ SIKORSKI J. Phys. IV France, 03 C4 (1993) C4-225-C4-231 DOI: 10.1051/jp4:1993434