1. Albert, A.E., Gardner, L.A., Jr.: Stochastic approximation and nonlinear regression. Cambridge, Mass: MIT Press 1967
2. Geman, S.: SIAM J. Appl. Math.36, 86–105 (1979)
3. Grenander, U.: Private communication (1981)
4. Kohonen, T.: Automatic formation of topological maps of patterns in a self-organizing system. In: Proc. 2nd Scand. Conf. on Image Analysis, Oja, E., Simula, O. (eds) pp. 214–220. Espoo: Suomen Hahmontunnistustutkimuksen Seura 1981
5. Kohonen, T.: Self-organized formation of topologically correct feature maps. Biol. Cybern.43, 59–69 (1982)