A General Implementation of Relational Recursion with Speedup Techniques for Programmers. - A. Clouatre; Normand Laliberte; T. H. Merrett (Inf. Process. Lett., 1989)

Including Scalars in a Programming Language Based on the Relational Algebra. - T. H. Merrett; Normand Laliberte (IEEE Trans. Software Eng., 1989)