1. S.
Balzer T.
Gross and
P.
Eugster
.
A relational model of object collaborations and its use in reasoning about relationships. In E. Ernst editor ECOOP volume
4609
of
Lecture Notes in Computer Science pages 323–
346
. Springer 2007. ISBN 978-3-540-73588-5. S. Balzer T. Gross and P. Eugster. A relational model of object collaborations and its use in reasoning about relationships. In E. Ernst editor ECOOP volume 4609 of Lecture Notes in Computer Science pages 323–346. Springer 2007. ISBN 978-3-540-73588-5.
2. The entity-relationship model—toward a unified view of data