The AQUA Data Model and Algebra. - Theodore W. Leung; Gail Mitchell; Bharathi Subramanian; Bennet Vance; Scott L. Vandenberg; Stanley B. Zdonik (DBPL, 1993)

Ordered Types in the AQUA Data Model. - Bharathi Subramanian; Stanley B. Zdonik; Theodore W. Leung; Scott L. Vandenberg (DBPL, 1993)

The AQUA Approach to Querying Lists and Trees in Object-Oriented Databases. - Bharathi Subramanian; Theodore W. Leung; Scott L. Vandenberg; Stanley B. Zdonik (ICDE, 1995)

Expressing and Optimizing Queries Over Lists and Trees. - Bharathi Subramanian (1996)