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2. 2023a. https://afdc.energy.gov/files/u/publication/fuel_comparison_chart.pdf. 1-3.
3. 2023b. https://en.wikipedia.org/wiki/Hydrogen_storage. 1.
4. 2023c. https://h2eg.com/. 1.
5. 2023d. https://h2tools.org/bestpractices/electrical. 1.