Probabilistic Databases of Universal Schema, Limin Yao, Sebastian Riedel and Andrew McCallum, Proceedings of the AKBC-WEKEX Workshop at NAACL 2012 2012 [pdf]
@inproceedings{yao12probabilistic,
    month={June}, 
    year={2012}, 
    author={Limin Yao and Sebastian Riedel and Andrew McCallum}, 
    bdsk-url-1={http://ciir-publications.cs.umass.edu/getpdf.php?id=1061}, 
    booktitle={Proceedings of the AKBC-WEKEX Workshop at NAACL 2012}, 
    title={Probabilistic Databases of Universal Schema}, 
}