1. See, for example, Bryman, D.A., Comm. Nucl. Part. Phys. 21, 101 (1993); A. Pich, Proc. Int. Worksp. on Phys. Beyond the Standard Model: From Theory to Experiment (Valencia 97), Valencia, Spain, hepph/9802257 (1997).
2. See the lecture notes by Nakamura, K., in these proceedings.
3. Wolfenstein, L., Phys. Rev. Lett. 13, 562 (1964); see also Wolfenstein, L., Comm. Nucl. Part. Phys. 21, 275 (1994).
4. Hincks, E.P. and Pontecorvo, B., Phys. Rev. 74, 697 (1948).
5. Ritchie, J.L. and Wojcicki, S.G., Rev. Mod. Phys. 65, 1149 (1993).