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2. The design of a single-stage relief valve with directional damping;Watton;Journal of Fluid Control Including Fluidics Quarterly,1988
3. A dynamic bondgraph model of the fluid mechanical interaction in spool valve control orifice;Borutzky,1992
4. Simulation by Bondgraph;Thoma,1990
5. Static and dynamic characteristics of a two stage pilot relief valve;Chin;ASME Dynamic Systems Measurements and Controls,1991