Colangelo, G.Gasser, J.Leutwyler, H.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1890710.17877/DE290R-6683enThe American Physical SocietyPhysical Review Letters530The Quark Condensate from Ke4 Decays10.1103/PhysRevLett.86.5008article (journal)