@inproceedings{klein2001treebank,
 author = {Dan Klein and Christopher D. Manning},
 booktitle = {Association for Computational Linguistics (ACL)},
 title = {Parsing with Treebank Grammars: Empirical Bounds, Theoretical Models, and the Structure of the Penn Treebank},
 url = {https://nlp.stanford.edu/pubs/klein2001treebank.pdf},
 year = {2001}
}