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Additional information
P. L. Kapitsa Institute of Physics Problems. Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No.s 9–10, pp. 35–37, September–October, 1998.
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Butkevich, I.K., rydnik, E.A. & Khalpakhchi, D.Y. Automated control system for a helium liquefier. Chem Petrol Eng 34, 592–594 (1998). https://doi.org/10.1007/BF02418435
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DOI: https://doi.org/10.1007/BF02418435