1. Abramowitz, M. and Stegun, I.A. (eds.) 1965.Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Dover: New York, NY, USA.
2. Åström, K. and Morin, L. 1992. Random cross ratios.Rapport Technique RT88 IMAG-14, LIFIA, LIFIA, Institut Imag, Grenoble, France.
3. Cramér, H. 1945.Mathematical Methods of Statistics. Princeton Mathematical Series, Vol. 9. Princeton: Princeton University Press (Eighteenth Printing 1991).
4. Devijver, P.A. and Kittler, J. 1982.Pattern Recognition: a statistical approach. Prentice Hall: London, UK.
5. Forsyth, D., Mundy, J.L., Zisserman, A., Coelho, C., Heller, A., and Rothwell, C. 1991. Invariant descriptors for 3D object recognition and pose. IEEE Trans. Pattern Analysis and Machine Intelligence, 13, 971?991.