1. S. L. Glashow:Nucl. Phys. B,20, 579 (1961);S. Weinberg:Phys. Rev. Lett.,19, 1264 (1967);A. Salam: inProceedings of the Eight Nobel Symposium, edited byN. Svartholm (Almquist and Wiskell, Stokholm, 1968), p. 367.
2. G. 't. Hooft:Nucl. Phys. B,33, 173 (1971);35, 167 (1971);G. 't Hooft andM. Veltman:Nucl. Phys. B,44, 189 (1972).
3. See,e. g., Proceedings of the Conference on Tests of Electroweak Theories, Trieste, June 1985, edited byB. W. Lynn andC. Verzegnassi (World Scientific, Singapore, 1987);LEP Physics, CERN report 86-02 (1986), edited byJ. Ellis andR. Peccei.
4. See LEP 200 ECFA Workshop (1987), CERN-EP/87-70.
5. A. Sirlin:Phys. Rev. D,22, 285 (1980).