Yongzhen Ou

Yongzhen Ou: On Mapping Between UML and Entity-Relationship Model, Workshop "Einsatz, Bewertung und Stand der Unified Modeling Language (UML)", 1997, (BibTeX entry).
Yongzhen Ou: On Using UML Class Diagram for Object-Oriented Database Design - Specification of Integrity Constraints, UML'98: Beyond the Notation - International Workshop (Preliminary Proceedings), 1998, (BibTeX entry).
Yongzhen Ou: On Using UML Class Diagram for Object-Oriented Database Design -- Specification of Integrity Constraints, UML'98: Beyond the Notation - International Workshop (Final Proceedings), 1998, (BibTeX entry).

dblp: Computer Science Bibliography (University of Trier, Germany). (Note that this does not always work due to different naming schemes.)