Ion-exchange with Pd/Pt and Fe and their reduction to metallic state in zeolites : positron annihilation and Mössbauer studies Zs. KAJCSOS, K. LÁZÁR et G. BRAUERJ. Phys. IV France, 03 C4 (1993) C4-197-C4-200DOI: https://doi.org/10.1051/jp4:1993427