1. F. Amman et al.:Status report on the 1.5 GeVelectron-positron storage ring Adone, inProc. Intern. Conf. on High-Energy Accelerators (Dubna, 1963), p. 249.
2. F. Amman et al.:Adone, the Frascati 1.5 GeVelectron-positron storage ring, inProc. V Intern. Conf. on High-Energy Accelerators (Frascati, 1965), p. 703.
3. F. Amman et al.:Adone status report, inProc. Symp. Intern. sur les Anneaux de Collisions (Saclay, 1966), III-2-1.
4. M. Bassetti, R. Littauer, C. Pellegerini, M. Sands andB. Touschek:Adone Int. Memoranda (1968) (unpublished).
5. The interpretation of the effect has been first proposed byC. Pellegrini, M. Sands andB. Touschek; a paper byC. Pellegrini on the subject is in course of publication.