1. ISPAHAN, an interactive system for statistical pattern recognition;Gelsema,1978
2. Investigation of multidimensional data using the interactive pattern analysis system ISPAHAN;Eden,1978
3. E. S. Gelsema, ISPAHAN User's Manual, 3rd edn, Free University, Amsterdam.
4. A nonlinear mapping for data structure analysis;Sammon;IEEE Trans. Comput. C-18,1969
5. A triangulation method for the sequential mapping of points from N-space to two-space;Lee;IEEE Trans. Comput. C-26,1977