1. Institute of Low
Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2, Poland
2. Université Clermont Auvergne, SIGMA
Clermont, Institut de Chimie de Clermont-Ferrand, BP 10448, F-63000 Clermont-Ferrand, France
3. Centre for Advanced Materials and Smart
Structures, Polish Academy of Sciences, Okolna 2, 50-950 Wroclaw, Poland