1. Atzeni P., Andmecca G. Automatic information extraction from large web sites. In.: Proceedings of the 16th ACMSIGMOD International Symposium on Principles of Database Systems (PODS’97) (Tucson, AZ). ACM, New York; 1977, p. 144-153.
2. HAMMER J., GARCIA-MOLINA H., CHO J., ARANHA R, CRESPO A. Extracting semistructured information from the Web. In Proceedings of the Workshop on the Management of Semistructured Data (in conjunction with ACM SIGMOD 1997). ACM, New York; 1997.
3. SAHUGUET A., AZAVANT F. Web ecology: Recycling HTML pages as XML documents using W4F. In Proceedings of the 2nd Workshop on the Web and Databases (WebDB’99) (in conjunctionwith SIGMOD’99). ACM, New York. 1999.
4. Lillian Lee. Learning of context-free languages: a survey of the literature, Report TR-12-96, Center for Research in Computing Technology, Harvard University, 1996.
5. Higuera C.D. LCurrent trends in grammatical inference, in Proc.Joint IAPR Int. Workshops Adv. Pattern Recognit, p.28-31, 2000.