Adding multi-layer semantics to the Greek Dependency Treebank Harris Papageorgiou author Elina Desipri author Maria Koutsombogera author Kanella Pouli author Prokopis Prokopidis author 2006-05 text Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06) Nicoletta Calzolari editor Khalid Choukri editor Aldo Gangemi editor Bente Maegaard editor Joseph Mariani editor Jan Odijk editor Daniel Tapias editor European Language Resources Association (ELRA) Genoa, Italy conference publication papageorgiou-etal-2006-adding https://aclanthology.org/L06-1467/ 2006-05