Schepers, I., D. Schmitz, D. Weiler, O. Cochoy, and U. Neumann. “A NOVEL MODEL FOR OPTIMIZED DEVELOPMENT AND APPLICATION OF SWITCHING VALVES IN CLOSED LOOP CONTROL”. International Journal of Fluid Power, vol. 12, no. 3, Nov. 2011, pp. 31-40, https://journals.riverpublishers.com/index.php/IJFP/article/view/461.