[1]
S. V. Dolgushev and V. M. Fomin, “Helium enrichment of natural gas in non-steady diffusion-sorption processes in the bed of glass microspheres”, ВМСС, vol. 1, no. 3, pp. 66–75, Apr. 2008, doi: 10.7242/1999-6691/2008.1.3.28.