Glenn Butler; Mixed gas bell diving deep ocean simulator complex, Proceedings of MTS/IEEE OCEANS'85 Conference, pp. 972 - 976, November 1985.
Glenn Butler, Andre Galerne; Diver Education Of The Future: Mixed Gas Bell Diving In A Deep Ocean Simulator, Proceedings of MTS/IEEE OCEANS'82 Conference, pp. 14 - 20, September 1982.
Glenn J. Butler, David J. Kenyon; Integration of instrumentation and control systems to meet the requirements of deep diving, Proceedings of MTS/IEEE OCEANS'75 Conference, p. 263, September 1975.