1. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, c/Sor Juana Inés de la Cruz
3, 28049 Madrid, Spain
2. Institute of Low Temperature
and Structure Research, Polish Academy of Sciences, 2 Okolna Str., 50-422 Wroclaw, Poland
3. Center for Optical Materials
and Technologies, Belarusian National Technical University, 65/17 Nezavisimosti
Avenue, 220013 Minsk, Belarus