Neng-Fa Zhou. Channel Routing with Constraint Logic Programming and Delay. In Takushi Tanaka, Setsuo Ohsuga, Moonis Ali, editors, Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, Proceedings of the Ninth International Conference, Fukuoka, Japan, June 4-7, 1996. pages 383-388, Gordon and Breach Science Publishers, 1996.