1. Effects of speech rate, pitch, and pausing on survey participation decisions;Benki;Proc. Surv. Res. Meth. Sect. Am. Statist. Ass,2011
2. Accurate short-term analysis of the fundamental frequency and the harmonics-to-noise ratio of a sampled sound;Boersma;Proc. Inst. Phonet. Sci.,1993
3. Boersma , P. Weenink , D. 2007 Praat: doing phonetics by computer http://www.praat.org
4. Smiles can be backchannels;Brunner;J. Personlty Socl Psychol.,1979