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Cruz, I.F. and Mendelzon, A.O. and Wood, Peter (1988) G+: recursive queries without recursion. In: Kerschberg, L. (ed.) Expert Database Systems: Proceedings from the Second International Conference. Benjamin Cummings series in database systems and applications. Benjamin-Cummings Publishing Company, pp. 645-666. ISBN 9780805303111.

Cruz, I.F. and Mendelzon, A.O. and Wood, Peter (1987) A graphical query language supporting recursion. In: Dayal, U. and Traiger, I.L. (eds.) Proceedings of the Association for Computing Machinery Special Interest Group on Management of Data 1987 Annual Conference. Association for Computing Machinery, pp. 323-330. ISBN 9780897912365.