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*Juras Banys
Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania.
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Robertas Grigalaitis
Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania.
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Algirdas Brilingas
Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania.
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Andris Stenberg
Institute of Solid State Physic, University of Latvia, 8 Kengaraga str., 1063 Riga, Latvia.
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Vismants Zauls
Institute of Solid State Physic, University of Latvia, 8 Kengaraga str., 1063 Riga, Latvia.
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Karlis Bormanis
Institute of Solid State Physic, University of Latvia, 8 Kengaraga str., 1063 Riga, Latvia.