Using dexels to make hollow models for rapid prototyping. - Wai Kei Chiu; Sooi-thor Tan (Comput. Aided Des., 1998)

Multiple material objects: from CAD representation to data format for rapid prototyping. - Wai Kei Chiu; Sooi-thor Tan (Comput. Aided Des., 2000)

An automatic method for controlling the centre of gravity of a model. - Wai Kei Chiu; Sooi-thor Tan (Comput. Aided Des., 2002)