1. V. Angelopoulos et al.: Proc. of the Workshop on Physics at Future Accelerators, La Thuile, 1987, Vol. I, p. 80, CERN-87-07; A. Savoy-Navarro, N. Zaganidis: ibid., Proc. of the Workshop on Physics at Future Accelerators, La Thuile, 1987, Vol. II, p. 82; R. Batley: ibid., Proc. of the Workshop on Physics at Future Accelerators, La Thuile, 1987, Vol. II, p. 109; H. Baer, X. Tata, J. Woodside: Proc. of the Summer Study on High Energy Physics in the 1990's, Snowmass, 1988, p. 220; R.M. Barnett et al.: ibid., Proc. of the Summer Study on High Energy Physics in the 1990's, Snowmass, 1988, p. 226
2. F. Pauss: Proc. of the ECFA Large Hadron Collider Workshop, Aachen, 1990, Vol. I, p. 118, CERN-90-10, ECFA-90-133
3. S. Dawson, E. Eichten, C. Quigg: Phys. Rev. D 31 (1985) 1581 and references therein
4. For a review, see e.g.: H.P. Nilles: Phys. Rep. 110 (1984) 1; A.B. Lahanas, D.V. Nanopoulos: Phys. Rep. 145 (1987) 1
5. H.E. Haber, G.L. Kane: Phys. Rep. 117 (1985) 75