1. Allen, J.: An Interval-Based Representation of Temporal Knowledge. In: proceedings of the International Join Conference in Artificial Iintelligence (1981) pp221–226.
2. Allen, J., Hayes P.: A common-Sense Theory of Time. In: proceedings of the International Join Conference in Artificial Iintelligence (1985) pp528–531.
3. Allen, J., Hayes P.: Short Time Periods. In: proceedings of the International Join Conference in Artificial Iintelligence (1987) pp981–983.
4. Bettini C., Wang S., Jajodia S.: A general framework for time granularity and its application to temporal reasoning. Annals of Mathemetics and Artificial Intelligence 22 (1998) pp29–58.
5. Lect Notes Comput Sci;C. Bettini,1998