@inproceedings{oepen2002tlt,
 author = {Stephan Oepen and Dan Flickinger and Kristina Toutanova and Christopher D. Manning},
 booktitle = {First Workshop on Treebanks and Linguistic Theories (TLT2002)},
 title = {LinGO Redwoods. A Rich and Dynamic Treebank for HPSG},
 url = {https://nlp.stanford.edu/pubs/oepen2002tlt.pdf},
 year = {2002}
}