BangertH. (1992). Update on proportional valve performance, Hydraulics and Pneumatics, 45 Issue pp. 41–4, 46.
2.
CullmanJ. (1990). Electrohydraulic motion control, Automation, 37 Issue pp. 44–6.
3.
ElmerK. F.HenthornK. S.SkellernP. (1996). Practical noise location in a closed loop control system. International Conference on Identification in Engineering Systems, Swansea, March 1996. pp 215–224.
4.
MattenN. (1994). Measures to Significantly Improve the Dynamics of Proportional Directional Valves, Third Scandinavian International Conference on Fluid Power. pp 177–197.
5.
MorleyA.HughesE. (1994). Principles of Electricity (fifth edition) Longman — ISBN 0-582-22874-3.
6.
PrestP. H.VaughanN. D. (1987). Drive Circuits for Pulse Width Modulated Valves. International conference on Fluid Power, March 1987.
7.
VaughanNDGambleJB (1990). The Modelling and Simulation of a Proportional Solenoid Valve, ASME Winter Annual Meeting, Dallas, Texas, November 1990 paper 90-WA/FPST-11.