1. F. Boudjema et al., CERN Report CERN-89-08, ed. by G. Altarelli, R. Kleiss, C. Verzegnassi (1989), p. 185; G.F. Giudice et al., CERN Report CERN-96-01, ed. by G. Altarelli, T. Sjöstrand, F. Zwirner (1996), p. 463; and referencees therein
2. K. Hagiwara, D. Zeppenfeld, S. Komamiya, Zeit. Phys. C 29, 115 (1985)
3. F. Boudjema, A. Djouadi, J.L. Kneur, Zeit. Phys. C 57, 425 (1993)
4. A. Djouadi, Zeit. Phys. C 63, 317 (1994)
5. DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 380, 480 (1996)