1. See, for example, e + e − Collisions at 500 GeV: The physics potential edited by P M Zerwas, DESY Orange report, 92-123A+B, 93-12C
2. J F Donoghue and G Valencia, Phys. Rev. Lett. 58, 451 (1987)
3. C A Nelson, Phys. Rev. D41, 2805 (1990)
4. G L Kane, G A Ladinsky and C-P Yuan, Phys. Rev. D45, 124 (1991)
5. C R Schmidt and M E Peskin, Phys. Rev. Lett. 69, 410 (1992)