Comment: On Respondent-Driven Sampling and Snowball Sampling in Hard-to-Reach Populations and Snowball Sampling Not in Hard-to-Reach Populations
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Carroll Lewis, 1871, Through the Looking-Glass, and What Alice Found There
Foucault Michel, 1977, Language, Counter-Memory, Practice
Volz Erik, 2008, Journal of Official Statistics, 24, 79