TY - GEN T1 - Compacting the Penn Treebank Grammar T2 - arXiv PY - 1999/01/31 AU - Krotov A AU - Hepple M AU - Gaizauskas R AU - Wilks Y ED - DO - DOI: 10.48550/arxiv.cs/9902001 Y2 - 2025/11/29 ER -