H. Fliegel, und R. DiEsposti. Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting, Seite 189--200. Reston, Virginia, (Dezember 1996)
J. Strötgen, und M. Gertz. Proceedings of the 5th International Workshop on Semantic Evaluation, Seite 321--324. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)