The following publications are possibly variants of this publication:
- Some Problems Concerning Armstrong Relations of Dual Schemes and Relation Schemes in the Relational DatamodelJános Demetrovics, Vu Duc Thi. actaC, 11(1-2):35-48, 1993. [doi]
- Some Remarks on Functional Dependencies in Relational DatamodelsVu Duc Thi, Le Thi Thanh. actaC, 11(4):345-352, 1994. [doi]
- Normal Forms and Minimal Keys in the Relational DatamodelJános Demetrovics, Vu Duc Thi. actaC, 11(3):205-216, 1994. [doi]
- Some Results About Normal Forms for Functional Dependency in the Relational DatamodelJános Demetrovics, Vu Duc Thi. DAM, 69(1-2):61-74, 1996. [doi]
- On Relational Database Schemes Having Unique Minimal KeyJoachim Biskup, János Demetrovics, Leonid Libkin, Ilya B. Muchnik. eik, 27(4):217-225, 1991.