title: object-relational database systems : principles , products , and challenges ( tutorial ). authors: michael j. carey , anil nori , nelson mendonça mattos. venue: sigmod conference. year: 1997.0
title: object-relational database systems ( tutorial ) : principles , products and challenges. authors: michael j. carey , nelson m. mattos , anil k. nori. venue: international conference on management of data. year: 1997.0