1. A virtual repository approach to clinical and utilization studies: application in mammography as alternative to a national database;Ohno-Machado,1997
2. Chen, I, A, Kosky, A, Markowitz, V, M, Szeto, E, OPM*QS: the object-protocol model multidatabase query system. Technical Report LBNL-38181, Lawrence Berkeley National Laboratory, 1995.
3. Kleisli, a functional query system;Wong;J Funct Program,1998
4. Stevens, R, Goble, C, A, Paton, N, W, Bechhofer, S, Ng, G, Baker, P, Brass, A. Complex query formulation over diverse information sources using an ontology. In: Bornberg-Bauer, E, De Beuckelaer, A, Kummer, U, Rost, U, editors. Workshop on Computation of Biochemical Pathways and Genetic Networks, European Media Lab (EML), August 1999; 83–8.
5. Unifying Heterogeneous Distributed Clinical Data in a Relational Database;Marrs,1994