1. Proceedings of the Workshop on Physics at Future Accelerators, La Thuile 1987, J.H. Mulvey (ed.), CERN Yellow Book 87-07; Proceedings of the 1st Workshop on the Japan Linear Collider, KEK, Tsukuba, 1989, S. Kawabata (ed.), KEK preprint 90-2
2. Proceedings of the Workshop on Physics and Experiments with Linear Colliders, Lappland, Finland 1991, R. Orava (ed.)
3. See e.g. Proceedings of the Workshop on Experiments, Detectors and Experimental Areas for the Supercollider, Berkeley 1987, R. Donaldson, M. Gilchriese (eds.) Singapore World Scientific 1988; Proceedings of the Large Hadron Collider Workshop, Aachen 1990, G. Jarlskog, D. Rein, (eds.) CERN Yellow Book 90-10
4. E. Witten: Nucl. Phys. B120 (1977) 189
5. C.H. Llewellyn Smith: Phys. Lett. B79 (1979) 83