1. Cowie, J., and W. Lehnert. Information Extraction. Communications of the ACM. Vol. 39, No. 1, pp. 80–91, 1996[11].
2. Pazienza, M. T. Information Extraction. LNAI Tutorial. Springer, 1997.
3. Kontos, J. Syntax-Directed Processing of Texts with Action Semantics. Cybernetica, 23, 2 pp. 157–175, 1980.
4. Kontos, J. Syntax-Directed Plan Recognition with a Microcomputer. Microprocessing and Microprogramming. 9, pp. 227–279, 1982.
5. Kontos, J. Syntax-Directed Fact Retrieval from Texts with a Micro-Computer. Proc. [12]MELECON ′83, Athens, 1983.