1. MIT Symposium on Airport Security;Grodzins,1990
2. Proc. 1st Int. Symp. on Explosive Detection Technology;Grodzins,1991
3. Contraband and Cargo Inspection Technology Int. Symp.;Rushbrooke,1992
4. Contraband and Cargo Inspection Technology Int. Symp.;Eilbert,1992
5. Contraband and Cargo Inspection Technology Int. Symp.;Bjorkholm,1992