Representing Exceptions in Rule-Based Systems. - P. L. Tan; Tharam S. Dillon; John Zeleznikow (Australian Joint Conference on Artificial Intelligence, 1988)

Modelling Exceptions in Semantic Database and Knowledge-based Systems. - P. L. Tan; Tharam S. Dillon; John Zeleznikow (KBCS, 1989)

The conceptual design of OSEA: an object-oriented semantic data model. - P. L. Tan; Tharam S. Dillon (COMPSAC, 1990)