1. J.C. Bezdek, “Pattern Recognition with Fuzzy Objective Function Algorithms”, Plenum, 1981.
2. J.C. Bezdek, “Prototype Generating Clustering Algorithms“, Proceedings of Fifth International Fuzzy Systems World Congress, pp. XXXVI-XLIII, Seoul, 1993.
3. P. Cavanaugh, “What’s up in top-down processing?”, in A. Gorea (ed.) Representations of Vision: Trends and tacit assumptions in vision research, pp. 295–304, 1991.
4. E. Borowski, J. Borwein, “The Harper-Collins Dictionary of Mathematics”, p.135, HarperCollins, 1991.
5. O. Faugeras, “Three-Dimensional Computer Vision — A Geometric Viewpoint”, pp.497–504, MIT Press, 1993.