1. A recent updated review of the subject has been given in: G. Altarelli, R. Kleiss and C. Verzegnassi, eds., Z physics at LEP1, CERN report CERN-89-08.
2. B.W. Lynn, M.E. Peskin and R.G. Stuart, CERN Yellow Book 86-02, eds. J. Ellis and R. Peccei, p. 90.
3. Electroweak one-loop corrections to the decay of the neutral vector boson
4. The width of theZ boson
5. See, for instance, M. Kuroda, G. Moultaka and D. Schildknecht, CERN preprint CERN-TH-5818/90.