1. See the reference list inA. B. Clegg:NN*electroproduction: experimental results, inProceedings of the IV International Symposium on Electron and Photon Interactions at High Energies, Liverpool, 1969 (Daresbury, 1969), p. 123.
2. W. Albrecht, F. W. Brasse, H. Dorner, W. Flauger, K. H. Frank, J. Gayler, V. Korbel, J. May, P. D. Zimmerman, A. Courau, A. Diaczek, J. C. Dumas, G. Tristram, J. Valentin, C. Aubret, E. Chazelas andE. Ganssauge:Nucl. Phys.,25 B, 1 (1970); the same authors plusW. Fehrenbach:Nucl. Phys.,27 B, 615 (1971). See also:J. Gayler: Thesis (Hamburg, 1971) and DESY Internal Report F21-71/2 (1971);J. May: Thesis (Hamburg, 1971) and DESY Internal Report F21-71/3 (1971).
3. R. D. Hellings, J. Allison, A. B. Clegg, F. Foster, G. Hughes, R. Kummer, R. Siddle, B. Dickinson, M. Ibbotson, R. Lawson, H. E. Montgomery, W. J. Shuttleworth, A. Sofair andJ. Fannon:Nucl. Phys.,32 B, 179 (1971); the same authors plusV. P. R. Nuthakki andO. T. Turner: Daresbury Nuclear Physics Laboratory preprint DNPL/P 82 (1971).
4. See the reference list inF. Gutbrod:Electroproduction of baryon resonances (theory), inProceedings of the IV International Symposium on Electron and Photon Interactions at High Energies, Liverpool, 1969 (Daresbury, 1969), p. 141.
5. E. Amaldi:The electroproduction of pions, Internal Report of the Instituto di Fisica G. Marconi, Università di Roma, No. 299 (1971), and references quoted therein.