@article{Grimmer2013,
author = {Grimmer, J. and Stewart, B.M.},
title= {Text as data: The promise and pitfalls of automatic content analysis methods for political texts},
year = {2013},
doi = {10.1093/pan/mps028},
journal = {Political Analysis},
volume = {21},
number = {3},
pages = {267--297},
}