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International Journal of Hydrogen Energy > 2008 > 33 > 18 > 4844-4848
Journal of Power Sources > 2008 > 176 > 1 > 118-121
International Journal of Hydrogen Energy > 2007 > 32 > 17 > 4503-4509
Journal of Power Sources > 2007 > 171 > 2 > 610-616