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Calì, Andrea and Calvanese, D. (2002) Optimized querying of integrated data over the web. In: Rolland, C. and Brinkkemper, S. and Saeki, M. (eds.) Engineering Information Systems in the Internet Context. IFIP Conference Proceedings 231. Kluwer, pp. 285-301.
Lorentzos, N.A. and Johnson, Roger (1987) TRAA model for a temporal relational algebra. In: Rolland, C. and Bodart, F. and Leonard, M. (eds.) Temporal Aspects in Information Systems: Proceedings of the IFIP Working Conference on Temporal Aspects in Information Systems. Elsevier.