- Datalog, volume 6702 of Lecture Notes in Computer Science, page 351-368. Springer, (2010)
- Logische Untersuchungen, Fifth edition, (2003)
- SIGMOD Record 33(2):87-94 (2004)
- SIGMOD Record 32(1):12-19 (2003)
- J. ACM 42(4):711-740 (1995)
- J. ACM 42(1):3-42 (1995)
- ACM Trans. Database Syst. 13(4):486-524 (1988)
- ACM Trans. Database Syst. 22(3):364-418 (1997)
- ICDE, page 2-13. IEEE Computer Society, (2011)
- LICS, page 306-315. IEEE Computer Society, (1999)
- LICS, page 16-27. IEEE Computer Society, (1998)
- LICS, page 65-78. IEEE Computer Society, (1995)
- (2011)cite arxiv:1112.0343Comment: Extended version of "Ontological Queries: Rewriting and Optimization" presented at ICDE 2011 .
- Inf. Syst. 37(4):320-335 (2012)
- Wilhelm Koebner, Breslau, (1884)
- CoRR (2011)
- AAAI, page 331-336. AAAI Press / The MIT Press, (1990)
- J. Web Sem. 9(4):453-473 (2011)
- SIGMOD Record 40(3):5-14 (2011)
- Dagstuhl Reports 1(8):96-124 (2011)


author