Hamdy F.M. Mohameda, K. Itoa, Y. Kobayashia, N. Takimotoc, Y. Takeokac, A. Ohirac
Free volume and permeabilities of O2 and H2 in Nafion membranes for polymer electrolyte fuel cells
Polymer (2008) 49, 3091
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http://dx.doi.org/10.1016/j.polymer.2008.05.003