Institution: | 1 Institute for Solid State Physics, Eötvös University, H-1088, Budapest, Múzeum krt. 6-8, Hungary 2 KFKI Research Institute for Materials Science, H-1525, Budapest, P.O. Box 49, Hungary 3 Joint Institute for Nuclear Research, Dubna, P.O. Box 79, Head Post Office, 101000, Moscow, Russia |