1. T. Nishikawa, Proc. IX-th Int. Conf. on High Energy Accelerators, SLAC (1974), p.584.
2. T. Kamei and T. Nishikawa, Proc. X-th Int. Conf. on High Energy Accelerators, Serpukohov (1977), p.77.
3. TRISTAN Design Report I, KEK (1978).
4. T. Suzuki and K. Yokoya, KEK Report (1980).
5. K. Yokoya, to be published.