Z. Wu, J. Wu, D. Sun, and X. Wu. Sixth International Symposium on Instrumentation and Control Technology: Sensors, Automatic Measurement, Control, and Computer Simulation, SPIE, (November 2006)
E. Smith, D. Lopresti, G. Nagy, and Z. Wu. Document Analysis and Recognition (ICDAR), 2011 International Conference on, page 1255-1259. (September 2011)
Z. Wu, J. Sun, Q. Liu, and G. Zhang. Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration, SPIE, (October 2008)