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Are you concerned with formal sampling or are you just concerned to devise
an appropriate research strategy?
If the former you might look at what Erickson and Nosanchuk did.
Erickson, B. H. and T. A. Nosanchuk (1983). "Applied network sampling." Social
Networks 5(4): 367-382.
If you are thinking about a broader research strategy you might find it useful
to see what Doreian and Woodward did with expanding selection.
Doreian, P. and K. L. Woodard (1994). "Defining and locating cores and
boundaries of social networks." Social Networks 16(4): 267-293.
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