1. L. Lederman: inProceedings of the Nineteenth International Conference on High-Energy Physics,Tokyo, Japan, 1978, p. 706.
2. G. Flügge: inProceedings of the Nineteenth International Conference on High-Energy Physics,Tokyo, Japan, 1978, p. 793.
3. K. Gottfried: inProceedings of the International Symposium on Electrons and Photons at Hamburg (1977), p. 667.
4. G. Feinberg andT. D. Lee:Phys. Rev. D,13, 3071 (1976); see alsoT. Hagiwara andA. I. Sanda:Phys. Rev. D,13, 3067 (1976);S. Nussinov,R. Raitio andM. Ross:Phys. Rev. D,14, 211 (1976);B. A. Arbuzov,G. Segre andJ. Weters:Phys. Lett.,61 B, 251 (1976).
5. S. Pakvasa andS. F. Tuan:Proceedings of Neutrino-78,C142 (1978).