Lundeen, J. S.Resch, K. J.Steinberg, A. M.2004-12-032004-12-0320012001http://hdl.handle.net/2003/106610.17877/DE290R-10883enThe American Physical SocietyPhysical Review Letters530Nonlinear Optics with Less Than One Photon10.1103/PhysRevLett.87.123603article (journal)