1. ACFA Linear Collider Working Group: K Abeet al, KEK report 2001-11, hep-ph/0109166
2. F Richard, J R Schneider, D Trines and A Wagner, hep-ph/0106314
3. American Linear Collider Working Group: T Abeet al, hep-ex/0106043
4. I Bigi and H Krasemann,Z Phys. C7, 127 (1981)
5. J Kühn,Acta Phys. Austr. Suppl. XXIV, 203 (1982)