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Dear Marieke,

See Nancy Howell Lee's book/dissertation, The Search for an Abortionist, 
from 1960s.

Michel Grossetti in Toulouse calls such searches, relational chains.

Reference group theory also seems appopriate.


   Barry Wellman
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   FRSC		              NetLab Network              INSNA Founder
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   University of Toronto                          Toronto Canada M5S 3G6
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