1. P. Abreu et al., DELPHI Coll.: ALPEH Coll.: CERN-PPE/93-40, 1993; P. Abreu et al., DELPHI Coll.: ALPEH Coll.: Contribution to the EPS Conference on HEP in Marseille, 1993, ALEPH-note 93-123; DELPHI Coll.: P. Abreu et al.: Nucl. Phys. B376 (1991) 511; P. Abreu et al., DELPHI Coll.: DELPHI 93-101 PHYS 328; P. Abreu et al., DELPHI Coll.: L3 Coll.: CERN-PPE/93-31, 1993; P. Abreu et al., DELPHI Coll.: L3 Coll.: prepared for the EPS Conference, Marseille, 1993, L3 note 1444; P.D. Acton et al., OPAL Coll.: Z. Phys. C58 (1993) 219; OPAL Coll.: CER-PPE/93-146, 1993
2. D. Schaile: Z. Phys. C54 (1992) 387; F. del Aguila, M. Martinez, M. Quiros: Nucl. Phys. B381 (1992) 451; J. Ellis, G.L. Fogli, E. Lisi: Phys. Lett. B274 (1992) 456; P. Langacker, M. Luo: Phys. Rev. D44 (1991) 817; G. Passarino: Phys. Lett. B255 (1991) 127; J. Ellis, G.L. Fogli: Phys. Lett. B249 (1990) 543; A. Blondel: CERN preprint CERN-EP/90-10, 1990
3. R. Barbieri et al.: Phys. Lett. B288 (1992) 95; J. Fleischer, O.V. Tarasov, F. Jegerlehner, P. Raczka: Phys. Lett. B293 (1992) 437; K.G. Chetyrkin, A. Kwiatkowski: Phys. Lett. B305 (1993) 285; K.G. Chetyrkin: Phys. Lett. B307 (1993) 169; K.G. Chetyrkin, J.H. Kühn: Phys. Lett. B308 (1993) 127
4. F. Abe et al., CDF Coll: Phys. Rev. Lett. 65 (1990) 2243
5. G. Altarelli, R. Barbieri, F. Caravaglios, Cern preprint, CERN-TH.6770/93; G. Altarelli: talk given at the XXVIIth Reconters de Moriond, CERN preprint, CERN-TH.6525/92 (1992), talk given at LP-HEP '91 Conference, 1991, CERN-TH.6245/91(1991), The Standard Electroweak Theory and its Experimental Tests, lectures given at the LVth Les Houches Summer School, France 1991, CERN-TH.6305/91; G. Altarelli, R. Barbieri: Phys. Lett. B253 (1990) 161; M.E. Peskin, T. Takeuchi: Phys. Rev. Lett. 65 (1990) 964; G. Altarelli, R. Barbieri, S. Jadach: Nucl. Phys. B369 (1992) 3; W.J. Marciano: BNL-45999(1991); B. Grinstein, M. Wise: Phys. Lett. B265 (1991) 326