1. Faculty of Physics; University of Bucharest; P.O. Box MG-11 077125 Bucharest Romania
2. Romanian Materials Science-Crystal Growth Society; 077125 Bucharest Romania
3. National Research and Development Institute in Microtechnologies; Str. Erou Iancu Nicolae 126 A 077190 Bucharest Romania
4. Faculty of Applied Chemistry and Materials Science; University Politehnica Bucharest; 1-7 Polizu Str 011061 Bucharest Romania
5. National Institute of Materials Physics; Str. Atomistilor 105 bis P.O. Box MG-7 077125 Bucharest Romania
6. Academy of Romanian Scientists; Splaiul Independentei 54 050094 Bucharest Romania