@article{Landis_1977,
title={The Measurement of Observer Agreement for Categorical Data},
volume={33},
ISSN={0006-341X},
url={http://dx.doi.org/10.2307/2529310},
DOI={10.2307/2529310},
number={1},
journal={Biometrics},
publisher={JSTOR},
author={Landis,
J. Richard and Koch,
Gary G.},
year={1977},
month=mar,
pages={159} }