Object Query Diagram: An Extended Query Graph for Object-Oriented Databases. - Jae Cheol Kwak; Songchun Moon (VL, 1993)

Visual query language for object-oriented databases: OQD. - Jae Cheol Kwak; Songchun Moon (Microprocess. Microprogramming, 1993)

Two-dimensional specification of queries in object-oriented databases. - Jae Cheol Kwak; Songchun Moon (Microprocess. Microprogramming, 1995)