Klindworth, M.Melzer, A.Piel, A.2004-12-032004-12-0320012001http://hdl.handle.net/2003/101210.17877/DE290R-10875enThe American Physical SocietyPhysical Review Letters530Normal Modes of 2D Finite Clusters in Complex Plasmas10.1103/PhysRevLett.87.115002article (journal)