https://www.scirp.org/reference/ReferencesPapers?ReferenceID=1529167
Pottmann, H. and Wallner, J. (2001) Computational Line Geometry. Springer Heidelberg Dordrecht,...
Pottmann, H. and Wallner, J. (2001) Computational Line Geometry. Springer Heidelberg Dordrecht, London, New York.