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https://en.wikipedia.org/wiki/Operation_Searchlight
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https://en.wikipedia.org/wiki/Guglielmo_Marconi
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https://hu.wikipedia.org/wiki/Guglielmo_Marconi
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https://hu.wikipedia.org/wiki/Heinrich_Hertz
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https://en.wikipedia.org/wiki/Heinrich_Hertz
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https://de.wikipedia.org/wiki/Guglielmo_Marconi
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https://hu.wikipedia.org/wiki/Antoine_Lavoisier
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https://en.wikipedia.org/wiki/Antoine_Lavoisier
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https://en.wikipedia.org/wiki/Franz_Schall
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http://www.luftwaffe.cz/schall.html
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