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Sampling knowledge: the hermeneutics of snowball sampling in qualitative research [journal article]
Source: International Journal of Social Research Methodology, 11 (2008) 4. p.327-344
Computerunterstützte Vercodung der International Standard Classification of Occupations (ISCO-88) [journal article]
Source: ZUMA Nachrichten, 28 (2004) 55. p.29-52