Model Combination for Event Extraction in BioNLP 2011, Sebastian Riedel, David McClosky, Mihai Surdeanu, Christopher D. Manning and Andrew McCallum, Proceedings of the Natural Language Processing in Biomedicine NAACL 2011 Workshop (BioNLP '11) 2011 [pdf]
@inproceedings{riedel11model,
    month={June}, 
    year={2011}, 
    author={Sebastian Riedel and David McClosky and Mihai Surdeanu and Christopher D. Manning and Andrew McCallum}, 
    bdsk-url-1={/publications/papers/riedel11model.pdf}, 
    booktitle={Proceedings of the Natural Language Processing in Biomedicine NAACL 2011 Workshop (BioNLP '11)}, 
    title={Model Combination for Event Extraction in BioNLP 2011}, 
}