1. Allen, J.F.: Maintaining knowledge about temporal intervals. Commun. ACM 26(11), 832–843 (1983)
2. Baader, F., Calvanese, D., McGuinness, D.L., Nardi, D., Patel-Schneider, P.F. (eds.): The Description Logic Handbook: Theory, Implementation, and Applications. Cambridge University Press (2003)
3. Balbiani, P., Condotta, J., del Cerro, L.F.: A model for reasoning about bidimensional temporal relations. In: Principles of Knowledge Representation and Reasoning, pp. 124–130. Morgan Kaufmann (1998)
4. Boll, S., Klas, W.: ZYX - A Multimedia Document Model for Reuse and Adaptation. IEEE Trans. on Knowledge and Data Engineering 13(3), 361–382 (2001)
5. Boll, S., Klas, W., Westermann, U.: Multimedia document models - sealed fate or setting out for new shores? In: Int. Conf. on Multimedia Computing and Systems, p. 9604. IEEE, Washington, DC (1999)