Institution: | 1. Department of Physics, Ewha Womans University, Seoul 120-750, South Korea;2. HAS Theoretical Physics Research Group, Hungary;3. Department of Theoretical Physics, Roland Eötvös University, H-1117 Budapest Pázmány s. 1/A, Hungary;4. University of Bologna, Physics Department, INFN Section, Via Irnerio 46, Bologna 40126, Italy |