1. Study of pneumatic processes in the continuous control of motion with compressed air-I, II;Shearer;Transactions of the ASME,1956
2. Use of the root loci in design of pneumatic servo-motors;Burrows;Control,1966
3. Festo. http://www.festo.com/INetDomino/coorp_sites/en/index.htm.
4. An analysis of a pneumatic servo system and its application to a computer controlled robot;Liu;Transaction of the ASME, Series G: Journal of Dynamic Systems, Measurement and Control,1988
5. Optimization of performance characteristics of electropneumatic (two-stage) servo valve;Igor;Transactions of the ASME: Journal of Dynamic Systems, Measurement, and Control,2004