Jaffar and Lassez, 1987 J. Jaffar , J.-L. Lassez, Constraint logic programming,

[POPL 1987] (1987) [ACM SIGACT-SIGPLAN] Proceedings of the 14th ACM SIGACT-SIGPLAN symposium on Principles of programming languages, January 21-23, 1987, Munich, West Germany  

Languages mentioned CLP(R) {1986} Constraint Logic Programming (Real)