1. HUN-REN Wigner Research Centre for Physics, H-1121 Budapest, Hungary
2. Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway
3. Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany
4. Csernai Consult Bergen, 5119 Ulset, Norway
5. MATE Institute of Technology, Károly Róbert Campus, Mátrai út 36, H-3200 Gyöngyös, Hungary
6. HUN-REN Centre for Energy Research, H-1121 Budapest, Hungary
7. Faculty of Informatics, Vytautas Magnus University, Vileikos 8, 44248 Kaunas, Lithuania
8. Department of Optics and Quantum Electronics, University of Szeged, H-6720 Szeged, Hungary