[4] King H., Helium: A Byproduct of the Natural Gas Industry, Awailable at: http://geology.com/articles/ helium/
[12] Stern S.A., Sinclair T.F., Gareis P.J., Vahldieck N.P., Mohr P.H.,
Helium Recovery by Permeation,
Industrial & Engineering Chemistry,
57(2): 49-60 (1965).
[23] Zadhoush A., Hosseini S.S., Mousavi S.M., The Importance and Influence of Rheological Characteristics of Polymer Solutions in Phase Inversion Process and Morphology of Polymeric Membranes, Iranian Journal of Polymer Science and Technology (PERSIAN), 28(5): 351-371 (2016).
[48] Bushell A.F., Attfield M.P., Mason C.R., Budd P.M., Yampolskii Y., Starannikova L., Rebrov A., Bazzarelli F., Bernardo P., Carolus Jansen J., Lanč M., Friess K., Shantarovich V., Gustov V., Isaeva V.,
Gas Permeation Parameters of Mixed Matrix Membranes Based on the Polymer of Intrinsic Microporosity PIM-1 and the Zeolitic Imidazolate Framework ZIF-8, J
ournal of Membrane Science,
427(0): 48-62 (2013).
[51] Fryčová M., Sysel P., Hrabánek P., Koèiøík M., Brabec L., Zikánová A., Bernauer B., Èapek P., Hejtmánek V.,
Helium Permeation through Mixed Matrix Membranes Based on Polyimides and Silicalite-1,
Diffusion Fundamentals, 11(0): 1-2 (2009).
[53] Song Q., Nataraj S.K., Roussenova M.V., Tan J.C., Hughes D.J., Li W., Bourgoin P., Alam M.A., Cheetham A.K., Al-Muhtaseb S.A., Sivaniah E.,
Zeolitic Imidazolate Framework (ZIF-8) Based Polymer Nanocomposite Membranes for Gas Separation,
Energy & Environmental Science,
5(8): 8359-8369 (2012).