Affiliation: | 1. Institute for Solid State Physics and Optics Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525, Budapest, P.O. Box 49, Hungary 2. P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii Prospect 53, Moscow, 119991, Russia 3. Centre for Advanced Quantum Physics Department of Physics, University of Bucharest, P.O. Box MG-11, R-077125, Bucharest-M?gurele, Romania 4. Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering, P.O. Box MG-6, Bucharest-M?gurele, Romania
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