Helium permeation through mixed matrix membranes based on polyimides and silicalite-1 - Fryčová, Marie; Sysel, Petr; Hrabánek, Pavel; Kočiřík, Milan; Brabec, Libor; Zikánová, Arlette; Bernauer, Bohumil; Čapek, Pavel; Hejtmánek, Vladimír (Diffusion Fundamentals, 2009)