1. Abelson, H., Sussman, G.-J., Sussman, J.: Structure and Interpretation of Computer Programs. MIT Press, Cambridge (1985)
2. Baumgartner, R., Gottlob, G., Flesca, S.: Visual information extraction with Lixto. In: Proceedings of the 27th International Conference on Very Large Databases, pp. 119–128. Morgan Kaufmann, Rome (2001)
3. Bertsimas, D., Lo, A.-W.: Optimal control of execution costs. J. Finan. Mark. 1(1), 1–50 (1998)
4. Brachman, R.-J., Schmolze, J.-G.: An overview of the KL-ONE knowledge representation system. Cogn. Sci. 9(2), 171–216 (1985)
5. Gottlob, G.: Complexity results for nonmonotonic logics. J. Logic Comput. 2(3), 397–425 (1992)