1. BAT, K-sonar, 2006. http://www.batforblind.co.nz/
2. Acquiring the reflectance field of a human face;Debevec,2000
3. Using artificial bat sonar neural networks for complex pattern recognition: Recognizing faces and the speed of a moving target;Dror;Biological Cybernetics,1996
4. N.L. Harper, P.J. McKerrow, Recognition of plants with CTFM ultrasonic range data using a neural network, in: Proceedings, IEEE International Conference on Robotics and Automation, ICRA’97, Albuquerque, April 1997, pp. 3244–3249
5. G. Kelly, The past perfect promise of facial recognition technology, ACDIS Occasional Paper, 2004. http://www.acdis.uiuc.edu/Research/OPs/Gates/contents/part2.html