H. Vandecasteele, B. Demoen, and G. Janssens. New Trends in Constraints, volume 1865 of Lecture Notes in Computer Science, page 256-273. Springer, (1999)
R. Moolenaar, H. Acker, and B. Demoen. ICLP Workshop on Parallel Execution of Logic Programs, volume 569 of Lecture Notes in Computer Science, page 54-69. Springer, (1991)