add literature

amu-literature.bib

@@ -1328,6 +1328,16 @@
   groups    = {transition-based-parsing},
 }
 
+@InProceedings{Liu2009,
+  author       = {Liu, Yudong and Sarkar, Anoop},
+  booktitle    = {{Proceedings of the 2009 Workshop on Grammar Engineering Across Frameworks}},
+  title        = {{Exploration of the LTAG-spinal formalism and treebank for semantic role labeling}},
+  year         = {2009},
+  organization = {Association for Computational Linguistics},
+  pages        = {1--9},
+  file         = {:Liu2009 - Exploration of the Ltag Spinal Formalism and Treebank for Semantic Role Labeling.PDF:PDF},
+}
+
 @Comment{jabref-meta: databaseType:bibtex;}
 
 @Comment{jabref-meta: grouping: