Michael J. Carey, Nelson Mendonça Mattos, Anil Nori. Object-Relational Database Systems: Principles, Products, and Challenges (Tutorial). In Joan Peckham, editor, SIGMOD 1997, Proceedings ACM SIGMOD International Conference on Management of Data, May 13-15, 1997, Tucson, Arizona, USA. pages 502, ACM Press, 1997. [doi]