[2] [2] ALLEN J.Maintaining knowledge about temporal intervals［J］.Communications of the ACM, 1983, 26(11):832-843.

[3] [3] ALLEN J.Towards a general theory of action and time［J］.Artificial Intelligence, 1984, 23(2):123-154.

[4] [4] D F CHTER R, MEIRI I, PEARL J.Temporal constraint networks［J］.Artificial Intelligence, 1991, 49:61-95.

[5] [5] GEREVINI A, SCHUBERT L.Efficient algorithms for qualitative reasoning about time［J］.Artificial Intelligence, 1995, 74:207-248.

[10] [10] MUSCETTOLA N, NAYAK P P, PELL B, et al.Remote agent:To boldly go where no AI system has gone before［J］.Artificial Intelligence, 1998, 103(1/2):5-47.