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2. Riggin, R.M., April 1984 and May 1988P Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air, EPA-600/4-84-041 (NTIS PB87-168688), April 1984 and May 1988.
3. Test results for fuel cell operation on anaerobic digester gas;Spiegel;J. Power Sources,2000
4. Fuel cell operation on landfill gas at Penrose power station;Spiegel;Energy,1999
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