db/journals/dpd/SubramanianS98.html D. K. Subramanian K. Subramanian Query Optimization in Multidatabase Systems. 183-210 DPD/6/P183.pdf 1998 6 Distributed and Parallel Databases 2 db/journals/dpd/dpd6.html#SubramanianS98 http://kapis.www.wkap.nl/oasis.htm/153628