1. B.K.P. Horn, ?Robot Vision?, The MIT Press, Cambridge, Massachusetts-London, England, 1986.
2. H.L. Van Trees, ?Detection, Estimation, and Modulation Theory (Part I)?, John Wiley and Sons Inc., New York-London-Sydney, 1968.
3. D. Terzopoulos, ?Image Analysis using Multigrid Relaxation Methods?, IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. PAMI-8, No. 2, pp. 129?140, Mar. 1986.
4. T. Poggio, V. Torre, C. Koch, ?Computational Vision and Regularisation Theory?, ?Readings in Computer Vision?, pp. 638?645, Morgan Kaufmann Publishers Inc., Los Altos, California, 1987.
5. W.H. Press, B.P. Flannery, S.A. Teukolsky, W.T. Vetterling, ?Numerical Recipes in C: The Art of Scientific Computing?, Cambridge University Press, Cambridge-New York-Port Chester-Melbourne-Sydney, 1988.