Larycheva, L., O. Lutsenko, Y. Chernenko, and N. Voloshyn. “Influence of Impurities in Propane Coolant on the Process of Obtaining Artificial Cold”. Eastern-European Journal of Enterprise Technologies, vol. 6, no. 8 (90), Dec. 2017, pp. 55-62, doi:10.15587/1729-4061.2017.118805.