ORL: an object retrieval language interface to an object algebra. - Susan Darling Urban; Chiung-hsun Chen Lai; Sanjay Saxena (COMPSAC, 1992)

The design and translation of ORL: An object retrieval language. - Susan Darling Urban; Chiung-hsun Chen Lai; Sanjay Saxena (J. Syst. Softw., 1994)