1. 2. “The Captured Air Bubble (CAB) Concept,” National Aer-National Meeting, Washington, D.C. SAE Report 697C, 611 April 1963.
2. 4. UK Patent Specification No. 1,184,062, Date of Application: 14 March 1966.
3. 5. United States Patent No. 3,559,608, Patented 2 February 1971.