1. M. Jacob, pp Collider Physics: Present and Prospects, these Proceedings.
2. A. Astbury et al., Phys. Scr. 23:397 (1981).
3. B. Mansoulié, Proc. Moriond Workshop on Antiproton-Proton Physics and the W Discovery, La Plagne, Savoie, France, 1983, Ed. Frontières, Gif-sur-Yvette (1983), p. 609.
4. G. Arnison et al., Phys. Lett. 139B:115 (1984).
5. For a review see: J. Ellis et al., Ann. Rev. Nucl. Part. Sci. 32:443 (1982).