Kadhom, Hatam Kareem, and Fikrat Abdul-Kareem Fattah. “Modification of Electro - Pneumatic Elevator System Depending on the Air Pressure and Flow Rate Determinations”. Wasit Journal of Engineering Sciences, vol. 6, no. 2, Aug. 2018, pp. 56-65, https://doi.org/10.31185/ejuow.Vol6.Iss2.92.