1. Fuchi, K., F. Mizoguchi, K. Furukawa and J.-L. Lassez ed.; Constraint Logic Programming, Chap. 1 (Seiyaku Ronri Programming), pp. 1–12, Kyoritu Shuppan, Tokyo, Japan (1989)
2. Fukushima, M.; Introduction to Mathematical Programming (Suri Keikaku Nyumon), pp. 145–151, Asakura Shoten, Tokyo, Japan (1996)
3. Hybrid mixed-integer/constraint logic programming strategies for solving scheduling and combinatorial optimization problems