1. KTeV Collaboration, A. Alari-Harati et al., Phys. Rev. Lett. 83 (1999) 22; G. Barr, Plenary talk at XIX Intl. Symp. on Lepton-Photon Interactions at High Energies, Stanford University, 8/7/99-8/14/99.
2. E.g. see J.F. Donoghue, E. Golowich, B.R. Holstein, Dynamics of the Standard Model, Cambridge University Press, Cambridge, England 1992.
3. Precise Relations between the Spectra of Vector and Axial-Vector Mesons
4. L.V. Lanin, V. P Spirodonov, K.G. Chetyrkin, Yad. Fiz. 44 (1986) 1372. For earlier work, see also M. Shifman, A. Vainshtein, V. Zakarov, Nucl. Phys. B 147 (1979) 385.
5. Anatomy of a weak matrix element