@inproceedings{inproceedings, title  = {{Compacting the Penn Treebank Grammar.}},

 publisher = {{Morgan Kaufmann Publishers / ACL}},

 url = {{https://aclanthology.org/volumes/P98-1/ }},

 year = {{1998}},

 month = {{1}},

 author = {{Krotov A and Hepple M and Gaizauskas RJ and Wilks Y}},

 journal = {{COLING-ACL}},

 pages = {{699-703}},

 note = {{Accessed on 2025/11/18}}}