Tejada, S.; Knoblock, C. A. & Minton, S.: Learning Object Identification Rules for Information Integration. In: Information Systems Journal 26 (2001), Nr. 8, S. 635-656
[BibTeX] 

Kifer, M.; Lausen, G. & Wu, J.: Logical Foundations of Object-Oriented and Frame-Based Languages. In: Journal of the ACM 42 (1995), Nr. 4, S. 741-843
[BibTeX]