AppTek Turkish-English machine translation system description for IWSLT 2009 Selçuk Köprü author 2009-dec 1-2 text Proceedings of the 6th International Workshop on Spoken Language Translation: Evaluation Campaign Tokyo, Japan conference publication kopru-2009-apptek https://aclanthology.org/2009.iwslt-evaluation.2/ 2009-dec 1-2 19 23