1. T. Alväger, J. Blomqvist andP. Ermann:1963 Annual Report of Nobel Research Institute, Stockholm (unpublished);
2. T. Alväger, P. Ermann andA. Kerek:1965 Annual Report of Nobel Research Institute, Stockholm (unpublished);
3. Nobel Institute preprint (Stockholm, 1966). See alsoB. Maglic, J. Norem, J. Oostens, H. Brody, E. Groves, R. Van Berg, W. Wales, G. Cvijanovich andR. Schluter:Bull. Am. Phys. Soc.,14, 840 (1969).
4. T. Alväger andM. N. Kreisler:Phys. Rev.,171, 1357 (1968).
5. M. B. Davies, M. N. Kreisler andT. Alväger:Phys. Rev.,183, 1132 (1969).