title: a data model and data structures for moving objects databases l forlizzi , r gќting , e nardelli , m schneider. authors: nan. venue: sigmod conference. year: 2000.0
title: 1548 classic : a structural data model for objects . 1549 in proceedings of the 1989 acm sigmod international conference. authors: a borgida , rj brachman , dl mcguinness , la resnick. venue: nan. year: nan