Hybrid image and signal processing : 7 - 8 April 1988, Orlando, Florida
Hybrid image and signal processing II : 18 - 20 April 1990, Orlando, Florida ; proceedings
Optical pattern recognition X : 7 - 8 April 1999, Orlando, Florida
Optical processing and computing : a tribute to Adolf Lohmann ; 17 - 18 April 2001, Orlando, USA
Proceedings of the 2003 IEEE/ASME Joint Rail Conference : April 22 - 24, 2003, Chicago, Illinois
Proceedings of the 2003 IEEE/ASME Joint Rail Conference : April 24-24, 2003, Chicago, Illinois