1. Department
of Theoretical Physics, University of Debrecen, PO Box 5, H-4010 Debrecen, Hungary
2. Faculty
of Physics, Babeş-Bolyai University, Kogălniceanu Street 1, 400084 Cluj Napoca, Romania
3. Department
of Information Technology, University of Debrecen, PO Box 12, H-4010 Debrecen, Hungary
4. ELI-ALPS, ELI-HU Non-Profit Ltd, Dugonics tér 13, H-6720 Szeged, Hungary