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2. C.A. Reiser, Battery-boosted, Rapid Startup of Frozen Fuel Cell, United States Patent 0207162 A1 (2003).
3. N. Matsuoka, United States Patent 0013915 A1 (2004).
4. K. Korytnikov, Peter Novak, Method and Apparatus for Cold-starting A PEM Fuel Cell System,United States Patent 0227126 A1 (2005).