1. H. Burkhardt, Proc. Third Workshop on LEP Performance, J. Poole, ed., CERN SL/93-19 (DI).
2. R. Kleiss and H. Burkhardt, in preparation.
3. L. Maiani, G. Pancheri and N. Paver, eds., The DAΦNE Physics Handbook.
4. G. Alexander et al., preprint LNF-93/030 (P).
5. KLOE collaboration, report LNF-92/019 (R).