Bramati, A.Chinaglia, W.Conti, C.Di Trapani, P.Minardi, S.2004-12-032004-12-0320012001http://hdl.handle.net/2003/146110.17877/DE290R-12359enThe American Physical SocietyPhysical Review Letters530Focusing versus Defocusing Nonlinearities due to Parametric Wave Mixing10.1103/PhysRevLett.87.183902article (journal)