1. Bell, G. P. How Deep is Deep Enough? (Invited Paper). Proceedings of Cockpit and Future Displays for Defence and Security. 2005. Orlando, FL: SPIE volume # 5801, pp. 90–96.
2. Bell, G. P. Advanced Metrics-based Design Methodology for Multi-layer 3D Displays. Proceedings of Defence, Security, and Cockpit Displays. 2004. Orlando, FL: SPIE volume #5443, pp. 238–248.
3. Bell, G. P., Searle, M., Evanicky, D. Measurements and Metrics for Multi-layered Displays. Proceedings of Cockpit Displays X. 2003. Orlando, FL: SPIE volume #5080, pp. 27–38.