1. The Wankel R.C. Engine;Ansdale,1969
2. Vector loop analysis of Wankel compressors or engines;Leemhuis;ASME Paper 78-DET-1,1978
3. Rotary Piston Machines, Classification of Design Principles for Engines, Pumps, and Compressors;Wankel,1965
4. The geometry of trochoid envelopes and their application in rotary pumps