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Reference13 articles.
1. See, for example,E. W. Kolb andS. Turner:The Early Universe (Addison-Wesley, 1990).
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4. A. Vilenkin:Phys. Rep,121, 263 (1985).
5. See, for example,R. Rajaraman:Solitons and Instantons (North-Holland Publishing Co., 1982).