Key points are not available for this paper at this time.
Karl-Dieter Opp, Christiane Gern, Dissident Groups, Personal Networks, and Spontaneous Cooperation: The East German Revolution of 1989, American Sociological Review, Vol. 58, No. 5 (Oct., 1993), pp. 659-680
Opp et al. (Fri,) studied this question.
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