C. Callison-Burch, M. Osborne, und P. Koehn. Proceedings the Eleventh Conference of the European Chapter of the Association for Computational Linguistics, Seite 249--256. Trento, Italia, (2006)
J. DeNero, und D. Klein. Proceedings of ACL-08: HLT, Short Papers, Seite 25--28. Columbus, Ohio, Association for Computational Linguistics, (Juni 2008)