Using the Entity-Relationship Model for Implementing Multi-Model Database Systems. - Hai-Yann Hwang; Umeshwar Dayal (ER, 1981)

View Definition and Generalization for Database Integration in Multibase: A System for Heterogeneous Distributed Databases. - Umeshwar Dayal; Hai-Yann Hwang (Berkeley Workshop, 1982)

Using Semiouterjoins to Process Queries in Multidatabase Systems. - Hai-Yann Hwang; Umeshwar Dayal; Mohamed G. Gouda (PODS, 1984)

View Definition and Generalization for Database Integration in a Multidatabase System. - Umeshwar Dayal; Hai-Yann Hwang (IEEE Trans. Software Eng., 1984)

An Analytical Method for Estimating and Interpreting Query Time. - Hai-Yann Hwang; Yao-Tin Yu (VLDB, 1987)