1. J.F. Grivaz, Plenary talk at the WHEPP-6, Chennai, India (3-14 January, 2000);
2. A. Sopczak, hep-ph/0004015.
3. G.L. Kane, S.F. King, Phys. Lett. B 451 (1999) 113; M. Bastero-Gil, G.L. Kane, S.F. King, Phys. Lett. B 474 (2000) 103.
4. For a review and references to earlier works see, e.g.: M. Carena, C.E.M. Wagner, in: Perspectives on Higgs Physics II, G.L. Kane (Ed.), World-Scientific, Singapore (1998);
5. J. Cline, Plenary talk at the WHEPP-6, Chennai, India (3-14 January, 2000) hep-ph/0003029.