Qian, Y., and M. GuoXiang. “COMPUTATION OF INSTANTANEOUS POLYTROPIC EXPONENT OF DISCHARGE PROCESS OF A TANK WITH PRESSURISED GAS”. International Journal of Fluid Power, vol. 9, no. 2, Aug. 2008, pp. 27-33, https://journals.riverpublishers.com/index.php/IJFP/article/view/525.