Kageyama, H.Lüthi, B.Schmidt, S.Wolf, B.Zherlitsyn, S.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1899310.17877/DE290R-1722enThe American Physical SocietyPhysical Review Letters530Soft Acoustic Modes in the Two-Dimensional Spin System SrCu2(BO3)210.1103/PhysRevLett.86.4847article (journal)