A Comparison of Old and New Technologies for Translating Between Relational Query Languages. - D. I. Howells; Nick J. Fiddian; W. A. Gray (SSDBM, 1986)

A Source-to-Source Meta-Translation System for Relational Query Languages. - D. I. Howells; Nick J. Fiddian; W. A. Gray (VLDB, 1987)

A Source-to-Source Meta-Translation System for Database Query Languages - Implementation in Prolog. - D. I. Howells; Nick J. Fiddian; W. A. Gray (Prolog and Databases, 1988)