Wiens, T., R. Burton, G. Schoenau, and J. Ruan. “OPTIMIZATION AND EXPERIMENTAL VERIFICATION OF A VARIABLE RATIO FLOW DIVIDER VALVE”. International Journal of Fluid Power, vol. 6, no. 3, Nov. 2005, pp. 45-53, https://journals.riverpublishers.com/index.php/IJFP/article/view/567.