@inproceedings{bethard2004option,
 author = {Steven Bethard and Hong Yu and Ashley Thornton and Vasieleios Hativassiloglou and Daniel Jurafsky},
 booktitle = {AAAI Spring Symposium on Exploring Attitude and Affect in Text},
 title = {Automatic extraction of option propositions and their holders},
 url = {https://nlp.stanford.edu/pubs/bethard2004option.pdf},
 year = {2004}
}