Respondent mode choice in a smartphone survey
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Precision and disclosure in text and voice interviews on smartphones
Schober, Michael F.; Conrad, Frederick G.; Antoun, Christopher; Ehlen, Patrick; Fail, Stefanie; Hupp, Andrew L.; Johnston, Michael; Vickers, Lucas; Yan, H. Yanna; Zhang, Chan (2015). PLOS ONE10(6) [LINK]