2014-10-212014-10-2119871467-8659https://doi.org/10.1111/j.1467-8659.1987.tb00569.xA Formal Description Method for User Interfaces, October 1986 by Lynn MarshalOn New Types of Solid Models and their Visualization with Ray Tracing by J.J. van WijkGeometric Mine Modeling: Modeling of Three Dimensional Objects Based on Incomplete Information, 1985 by Olli KaronenIntegration of Free-Form Surfaces and Solid Modelling, 1985 by Per-Olof FjaTlliustroTm10.1111/j.1467-8659.1987.tb00569.x372-373