1. Domingos, P.: Prospects and challenges for multi-relational data mining. SIGKDD Explorations 5(1), 80–83 (2003)
2. Page, D., Srinivasan, A.: Ilp: a short look back and a longer look forward. J. Mach. Learn. Res. 4, 415–430 (2003)
3. Mitchell, T.M.: Generalization as search. Artificial Intelligence 18, 203–226 (1982)
4. Newell, A., Simon, H.A.: Human Problem Solving. Prentice-Hall, Englewood Cliffs (1972)
5. Cheeseman, P., Kanefsky, B., Taylor, W.: Where the really hard problems are. In: Proc. of the 12th International Joint Conference on Artificial Intelligence, pp. 331–340. Morgan Kaufmann, San Francisco (1991)