Lopez, Gus; Freeman-Benson, Bjorn; and Borning, Alan; "Kaleidoscope: A Constraint Imperative Programming Language" pp313-329

Constraint Programming, B. (1994) Constraint Programming, B. Mayoh, E. Tougu, J. Penjam (Eds.), NATO Advanced Science Institute Series, Series F: Computer and System Sciences, Vol 131, Springer-Verlag, 1994  

Languages mentioned Kaleidoscope {1989}