1. for example; A.W. Chao, AIP Proc. No. 105, American Institute of Physics, New York, 1983, p. 353.
2. H. Hama et al., Proc. 3rd, Asian Symp. on Free Electron Laser, IONICS Publishing Co. Ltd., Tokyo 1997, p. 17.
3. S.X. Fang et al., KEK Preprint 94-190, National Laboratory for High Energy Physics, Tsukuba 1995.
4. A. Nadji et al., Proc. 5th European Particle Accelerator Conf., Spain, 1996, p. 676.
5. Control of the bunch length on an electron storage ring