Iliev, Georgi, and Hristo Hristov. “SPEED CONTROL OF PNEUMATIC CYLINDERS USING HIGH SPEED 2 PORT ON OFF VALVES WITH PULSE WIDTH MODULATION”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, vol. 3, June 2024, pp. 95-100, https://doi.org/10.17770/etr2024vol3.8117.