Hydrogen internal combustion engine vehicle

https://www.wikidata.org/wiki/Q543770

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Physics 31.7M papers	Chemistry 28.4M papers	Engineering 23.9M papers	Organic chemistry 12.8M papers
Mechanical engineering 5.3M papers	Thermodynamics 5M papers	Physical chemistry 3.1M papers	Automotive engineering 866k papers
Combustion 374k papers		Internal combustion engine 63k papers
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Hydrogen internal combustion engine vehicle 520 papers
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