1. Altareva, E., Conrad, S.: The Problem of Uncertainty and Database Integration. In: Kutsche, R.-D., Conrad, S., Hasselbring, W. (eds.) Engineering Federated Information Systems, Proceedings of the 4th Workshop EFIS 2001, Berlin (Germany), October 9-10, pp. 92–99. infix-Verlag / IOS Press (2001)
2. Altareva, E., Conrad, S.: Dealing with Uncertainties during the Data(base) Integration Process. In: Weber, G. (ed.) Tagungsband zum 14. GI-Workshop Grundlagen von Datenbanken, Strandhotel Fischland, Halbinsel Fischland-Darß- Zingst, Mecklenburg-Vorpommern, May 21-24, pp. 6–10. Fachbereich Informatik, Universität Rostock (2002)
3. Kendall’s Library of Statistics;D. Bartholomew,1999
4. Basilevsky, A.: Statistical Factor Analysis and Related Methods: Theory and Applications. Wiley and Sons, New York (1994)
5. Beneventano, D., Bergamaschi, S., Guerra, F., Vincini, M.: The MOMIS Approach to Information Integration. In: ICEIS 2001, Proc. of the 3rd Int. Conf. on Enterprise Information Systems, Setubal, Portugal, July 7-10 (2001)