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2. Electron-photon shower distribution function;Messel,1970
3. S. Van der Meer, CERN internal report, ISR-PO/68-31 (unpublished). A correction has been applied for the contribution of elastic events.
4. G. Neuhofer et al., to be published.
5. UCRL 2426, Vol. 1 (unpublished) High Energy Particle Data.