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