Better Faster Pictures From Solid Models
This is a paper written by John Woodwark and Adrian Bowyer that sets the basis for software like OpenSCAD and the CSG part of the RepRap Host software:
File:Better-faster-pictures-Bowyer-Woodwark.pdf
The citation is:
Woodwark, J., & Bowyer, A.: Better and faster pictures from solid models, Computer-Aided Engineering Journal, Volume: 3, Issue: 1,pp 17-24, February 1986, ISSN: 0263-9327.