A Tree Kernel approach to Question and Answer Classification in Question Answering Systems Alessandro Moschitti author Roberto Basili 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 moschitti-basili-2006-tree https://aclanthology.org/L06-1440/ 2006-05