Carnahan, M. A.Chemla, D. S.Dodge, J. S.Kaindl, R. A.Schumacher, A. B.2004-12-032004-12-0320012001http://hdl.handle.net/2003/109910.17877/DE290R-4129enThe American Physical SocietyPhysical Review Letters530Parity-Forbidden Excitations of Sr2CuO2Cl2 Revealed by Optical Third-Harmonic Spectroscopy10.1103/PhysRevLett.87.127006article (journal)