EXAFS Investigation of the Ni2+ Environment in Heavy-Meta1 Fluoride Glasses M.A. Buñuel, R. Cases, J. García, M.G. Proietti and J.A. Solera J. Phys. IV France, 7 C2 (1997) C2-1219-C2-1220 DOI: 10.1051/jp4:19972202