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Journal Article SAMPLING BY REFERRAL IN A DISPERSED POPULATION Get access SUSAN WELCH SUSAN WELCH †The author is Associate Professor of Political Science at the University of Nebraska—Lincoln Search for other works by this author on: Oxford Academic Google Scholar Public Opinion Quarterly, Volume 39, Issue 2, SUMMER 1975, Pages 237–245, https://doi.org/10.1086/268221 Published: 01 January 1975
Susan Welch (Wed,) studied this question.