[1] CNR,DIPARTIMENTO CHIM INORGAN & METALLORGAN,VIA G VENEZIAN 21,I-20133 MILAN,ITALY
[2] DIPARTIMENTO CHIM ORGAN & IND,I-20133 MILANO,ITALY
[3] CNR,CTR SINTESI & STRUTTURA COMPOSTI MET TRANSIZ BASSI STATI OSSIDAZ,I-20133 MILAN,ITALY
[4] CNR,IST CHIM STRUTTURIST INORGAN,I-20133 MILAN,ITALY