[1] H. R. Kang, Proc. SPIE 2413, 410 (1995).
[2] K. D. Gentennet, Proc. SPIE 1909, 117 (1993).
[3] G. Cyberko, Math Control Signal System 2, 303 (1989).
[4] B. Chai, N. Liao, and D. Zhao, Chin. Opt. Lett. 2, 637 (2004).
[5] D. B. Fogel, IEEE Trans. Neural Network 5, 3 (1994).
[6] R. S. Berns, IS&T 45, 305 (2001).