1. Portable PEFC generator with propane as fuel;Ledjeff-Hey;J. Power Sources,2000
2. F. Mahlendorf, O. Niemzig, C. Kreuz, Low-Cost Bipolar Plates for PEM Fuel Cells, 2000 Fuel Cell Seminar, Portland, Oregon, 2000, pp. 138–140.
3. A. Heinzel, H. Kraus, C. Kreuz, F. Mahlendorf, O. Niemzig, Low-Cost Composite Bipolar Plates for PEM Fuel Cells, 2002 Fuel Cell Seminar, Palm Springs, CA, 2002, pp. 153–156.