1. Bottema, O. and Roth, B., (1990), Theoretical Kinematics, Dover Publ., New York.
2. Chazelle, B., Edelsbrunner, H., Guibas, L.J., Sharir, M. and Stolfi, J., (1996), Lines in space: combinatorics and algorithms, Algorithmica 15, 428–447.
3. Chen, H.Y. and Pottmann, H., (1997), Approximation by ruled surfaces, J. of Computational and Applied Math., submitted.
4. Ge, Q.J. and Ravani, B., (1994), On representation and interpolation of line segments for computer aided geometric design, ASME Design Automation Conf., vol. 96-1, 191–198.
5. Hlavaty, V., (1953), Differential Line Geometry, P. Nordhoff Ltd., Groningen.