1. M. G. Albrow, S. Anderson-Alhemed, B. Bosnjakovic, C. Daum, F. C. Erne, J. P. Lagnaux, J. C. Sens andF. Udo:Nucl. Phys.,25 B, 9 (1970);S. L. Baker, P. J. Dornan, G. P. Gopal, G. J. Webster, V. A. Bull, P. V. March, V. Tayler andD. W. Townsend:Nucl. Phys.,18B, 29 (1970);W. Busca, B. G. Duff, D. A. Garbutt, F. F. Heymann, C. C.Nimmon, K. M. Potter, T. P. Swetman, E. H. Bellamy, T. F. Buckley, R. W. Dobinson, P. V. March andJ. A. Strong:Phys. Rev.,180, 1339 (1969);A. S. Carroll, A. S. Fischer, A. Lundby, R. H. Phillips, C. L. Wang, F. Lobkowicz, A. C. Melissinos, Y. Nagashima andS. Tewksbury:Phys. Rev. Lett.,20, 607 (1968);C. T. Coffin, N. Dikmen, L. Ettlinger, D. Meyer, A. Saulys, K. Terwilliger andD. Williams:Phys. Rev. Lett.,17, 458 (1966);G. F. Kalmus, M. Michael, R. W. Birge, S. Y. Fung andA. Kernan: Preprint UCRL-19775 (July 1970);W. J. Metzger, B. Forman, A. C. Melissinos andT. Yamanouchi:Phys. Rev.,164, 1680 (1967). Throughout the analysis only the statistical errors given by the authors of experimental papers were used.
2. A. Donnachie andR. G. Kirsopp:Nucl. Phys.,10 B, 433 (1969).
3. A. Davies:Nucl. Phys.,21 B, 359 (1970);R. Ayed, B. Bareyre andG. Villet:Phys. Lett.,31 B, 598 (1970).
4. P. Auvil andC. Lovelace:Nuovo Cimento,33, 473 (1964).
5. V. D. Barger andD. Cline:Phys. Rev. Lett.,16, 913 (1966).