1. See, for example, The DAΦNE Physics Handbook, eds. L. Maiani, G. Pancheri and N. Paver, and references therein.
2. Proc. of the Workshop on Physics and Detectors for DAΦNE;Vignola,1991
3. F. Anulli et al., The DAΦNE Physics Handbook, Vol. II, eds. L. Maiani, G. Pancheri and N. Paver, p. 435.
4. G. Alexander et al., Two Photon Physics Capabilities of KLOE at DAΦNE, LNF-93/030(P).
5. Single photon emission in high-energy e+-e- collisions