What is the citation for the shared task introduction paper?
Answer: Please use the following bibtex citation:
@inproceedings{pradhan-etal-conll-st-2012-ontonotes,
author = {Sameer Pradhan and Alessandro Moschitti and Nianwen Xue and Olga Uryupina and Yuchen Zhang},
title = {{CoNLL-2012} Shared Task: Modeling Multilingual Unrestricted Coreference in {OntoNotes}},
booktitle = {{Proceedings of the Sixteenth Conference on Computational Natural Language Learning (CoNLL 2012)}},
year = {2012},
address = {Jeju, Korea}
}