Affiliation: | 1. Dipartimento di Fisica, Università dellla Calabria, Ponte P. Bucci Cubo 31C, 87036, Rende (CS), Italy 2. Licryl Regional Laboratory, INFM/CNR, Ponte P. Bucci, Cubo 33C, 87036, Rende (CS), Italy 3. Observatoire de la C?te d’Azur, CNRS, Nice, France 4. IFSI/CNR, Via Fosso del Cavaliere, Rome, Italy
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