1. A. N. Mitra: inLectures in Particles and Fields, edited byH. H. Ayl (London, 1970).
2. A. N. Mitra:Nuovo Cimento,61 A, 344 (1969);64 A, 603 (1969).
3. A. N. Mitra: Trieste preprint IC/70/58, to be published.
4. See, for example,R. H. Dalitz: inProceeding of the Oxford Conference on Elementary Particles, 1965;Proceedings of the XIII International Conference on High-Energy Physics, edited byM. Alston-Garnjost (Berkeley, 1967); 1966Tokyo Summer School.
5. D. K. Choudhury, D. L. Katyal andA. N. Mitra:Lett. Nuovo Cimento,2, 265 (1971).