Chavda, M. and Wood, Peter (1997) Towards an ODMG-compliant visual object query language. In: Jarke, M. and Carey, M.J. and Dittrich, K.R. and Lochovsky, F.H. and Loucopoulos, P. and Jeusfeld, M.A. (eds.) VLDB 97: Proceedings of 23rd International Conference on Very Large Data Bases. Morgan Kaufmann, pp. 456-465. ISBN 9781558604707.