@article{Jefferson1984,
author = {Jefferson, G.},
title= {Notes on a Systematic Deployment of the Acknowledgement Tokens 'Yeah' and 'Mm hm'},
year = {1984},
doi = {10.1080/08351818409389201 },
journal = {Research on Language and Social Interaction },
volume = {17},
number = {2},
pages = {197--216},
}