Wang, Tao, Kenji Kawashima, and Toshiharu Kagawa. 2007. “DETERMINATION OF CHARACTERISTICS FOR ELECTRICALLY MODULATED PNEUMATIC CONTROL VALVES USING ISOTHERMAL CHAMBERS”. International Journal of Fluid Power 8 (3):5-11. https://journals.riverpublishers.com/index.php/IJFP/article/view/533.