| Institution: | 1. Department of Physics , Vilnius Pedagogical University , Studentu? 39, 08106 Vilnius, Lithuania kkol@vpu.lt;3. Department of Physics , Vilnius Pedagogical University , Studentu? 39, 08106 Vilnius, Lithuania;4. Department of Physics , Vilnius Pedagogical University , Studentu? 39, 08106 Vilnius, Lithuania;5. Vilnius University , Institute of Theoretical Physics and Astronomy , A. Go?tauto 12, 01108 Vilnius, Lithuania;6. Department of Physics , Vilnius Technical University , Sauletekio al. 11, 10223 Vilnius, Lithuania |
