Modeling Relations and Their Mentions without Labeled Text, Sebastian Riedel, Limin Yao and Andrew McCallum, Proceedings of the European Conference on Machine Learning and Knowledge Discovery in Databases (ECML PKDD) 2010 [pdf] 
@inproceedings{riedel10modeling,
    year={2010}, 
    author={Sebastian Riedel and Limin Yao and Andrew McCallum}, 
    bdsk-url-1={/publications/papers/riedel10modeling.pdf}, 
    booktitle={Proceedings of the European Conference on Machine Learning and Knowledge Discovery in Databases (ECML PKDD)}, 
    title={Modeling Relations and Their Mentions without Labeled Text}, 
}