1. G. Alexander et al. (eds): Polarization at LEP, CERN 88-06
2. G. Altarelli et al., in: Physics at LEP, CERN 86-02, J. Ellis, R. Peccei, (eds)
3. J. Jersak, E. Laermann, P.M. Zerwas: Phys. Lett. 98B (1981) 363; Phys. Rev. D25 (1982) 1218
4. A. Sirlin: Phys. Rev. D22 (1980) 2695
5. H. Burkhardt, F. Jegerlehner, G. Penso, C. Verzegnassi, in: Polarization at LEP, G. Alexander et al. (eds) CERN 88-06 p. 145