A. M. Alashqur, Stanley Y. W. Su, Herman Lam. OQL: A Query Language for Manipulating Object-oriented Databases. In Peter M. G. Apers, Gio Wiederhold, editors, Proceedings of the Fifteenth International Conference on Very Large Data Bases, August 22-25, 1989, Amsterdam, The Netherlands. pages 433-442, Morgan Kaufmann, 1989. [doi]